GeezerVison

v8.12.4

Compare Source

⚠️ Security Fixes

This release fixes six vulnerabilities.

CVE-2026-116592 / GHSA-mqg3-3v4r-cm32 (high)

Undici 8.12.2 and 8.12.3 could cache the final response from a redirect chain under the original request key without applying the origin, cache policy, freshness, or Vary requirements of every intermediate hop. This could poison a cache or expose one user's response to another user. The fix validates every redirect hop, combines their Vary fields, limits freshness and stale serving to the most restrictive hop, and invalidates persistent SQLite entries written by vulnerable releases.

CVE-2026-120474 / GHSA-7xg3-fphp-28hg (medium)

A shared cache used with compose(redirect(), cache()) could store a credential-dependent response from a same-origin redirect under the original URL. A later authenticated or unauthenticated request could then receive another user's response. Redirected requests carrying Authorization, Cookie, or Proxy-Authorization are no longer stored under the original alias key.

CVE-2026-116630 / GHSA-5rm8-gv32-r954 (medium)

A cross-origin redirect during cache revalidation could let a 304 Not Modified response from the redirect target validate a cached response from the original origin. Undici now checks that the revalidation target matches the cached URL and that any returned validator matches the stored representation before replaying the cached body.

CVE-2026-120415 / GHSA-9v6h-8rgp-m69f (medium)

The redirect interceptor did not strip credentials correctly when request headers were supplied as an array of [name, value] pairs. With a header-normalizing interceptor outside redirect(), credentials could be sent to a cross-origin redirect target. Undici now handles both tuple arrays and flat header arrays when removing sensitive headers.

CVE-2026-120222 / GHSA-3g9m-rv3r-w5w2 (medium)

A downstream handler exception during cache replay could escape as an uncaught exception or unhandled promise rejection and terminate the process. This included dump size-limit failures, excessive Content-Encoding values in decompress, asynchronous cache-store failures, and cached-body replay after a 304. These failures are now reported as request errors.

CVE-2026-120423 / GHSA-r4pc-4jcp-7pqc (medium)

fetch() could skip Subresource Integrity verification when valid integrity metadata was separated or surrounded by ASCII whitespace other than a space, including a horizontal tab. Integrity metadata is now split on all ASCII whitespace before SHA-256, SHA-384, or SHA-512 verification.

What's Changed

• docs: clarify that origin is optional only for origin-bound dispatchers by @​attilayener in #​5994
• fix(mock): ignore the trailing slash before a query string by @​lprnmns in #​6031
• build(deps-dev): bump eslint from 10.12.0 to 10.13.0 by @​dependabot[bot] in #​6059
• build(deps-dev): bump neostandard from 0.14.0 to 0.14.1 by @​dependabot[bot] in #​6058
• docs: add QUERY to the documented retry default methods by @​qodelicious in #​6062
• docs: fix a couple of typos by @​qodelicious in #​6057
• build(deps): bump cronometro from 6.0.3 to 7.0.1 in /benchmarks by @​dependabot[bot] in #​5969
• fix: let interim 1xx responses through DecoratorHandler by @​mrityunjay-pandey in #​6028
• fix(types): declare FormData prototype methods by @​RlxChap2 in #​6056
• fix(cache): ignore SQLITE_BUSY in the sqlite cache store by @​isHeSatoshi in #​6049
• fix(http2): keep persistent error sink on released streams by @​mcollina in #​5983
• fix(h2): replay requests whose HEADERS raced a GOAWAY by @​mohamed-rdr in #​6065
• build(deps-dev): bump @​fastify/busboy from 3.2.3 to 3.2.4 by @​dependabot[bot] in #​6102
• build(deps-dev): bump undici from 6.29.0 to 6.29.1 by @​dependabot[bot] in #​6103
• disable wasm SIMD on the RISC-V by @​hrw in #​6041
• fix(mock): expose aborted on the mock dispatch controller by @​santiago-su in #​5964
• fix(fetch): avoid eager reads from async iterable bodies by @​Kesavamoorthig06 in #​5990
• fix(h2): preserve accepted streams with deferred ids by @​EpicHigh in #​6090
• fix(fetch): preserve abort propagation after garbage collection by @​BridgeAR in #​6070
• build(deps): bump actions/upload-artifact from 7.0.1 to 7.0.2 by @​dependabot[bot] in #​6125
• build(deps): bump step-security/harden-runner from 2.21.1 to 2.22.3 by @​dependabot[bot] in #​6127
• build(deps-dev): bump node-forge from 1.4.0 to 1.4.2 by @​dependabot[bot] in #​6134
• build(deps-dev): bump jsondiffpatch from 0.7.6 to 0.7.7 by @​dependabot[bot] in #​6140

New Contributors

• @​attilayener made their first contribution in #​5994
• @​lprnmns made their first contribution in #​6031
• @​RlxChap2 made their first contribution in #​6056
• @​isHeSatoshi made their first contribution in #​6049
• @​mohamed-rdr made their first contribution in #​6065
• @​hrw made their first contribution in #​6041
• @​santiago-su made their first contribution in #​5964
• @​EpicHigh made their first contribution in #​6090

Full Changelog: nodejs/undici@v8.12.3...v8.12.4

v8.12.3

Compare Source

What's Changed

• ci: use Python 3.14 for the WPT server on macOS by @​mrityunjay-pandey in #​6029
• build(deps-dev): bump neostandard from 0.13.0 to 0.14.0 by @​dependabot[bot] in #​6006
• build(deps-dev): bump eslint from 9.39.4 to 10.12.0 by @​dependabot[bot] in #​5967
• docs: document the options of interceptors.cache() by @​qodelicious in #​6050
• fix(h2): replace a connection that stops responding after a stream timeout by @​mcollina in #​6052
• fix(pool): keep caller async context for queued requests by @​mcollina in #​5982

New Contributors

• @​qodelicious made their first contribution in #​6050

Full Changelog: nodejs/undici@v8.12.2...v8.12.3

v8.12.2

Compare Source

Security fixes

High severity

Denial of service via TLS 1.2 certificate-changing renegotiation

CVE-2026-87018 · GHSA-qrxm-fqhp-jwvm

A malicious or compromised HTTPS server could crash the Node.js process by initiating TLS 1.2 renegotiation and presenting a different, CA-trusted certificate whose hostname did not match the requested host. The resulting socket error reached an assertion in undici's HTTP/1.1 and HTTP/2 connection handling. This release handles post-connect certificate errors without terminating the process.

TLS certificate validation bypass through dropped Agent options

CVE-2026-109383 · GHSA-2m5v-pch6-74hx

Agent used a JSON-based clone for constructor options, which silently removed function-valued TLS options such as checkServerIdentity. Applications relying on custom certificate or public-key verification could therefore accept a certificate that the callback was intended to reject. This release preserves TLS options when creating per-origin dispatchers.

Cache poisoning and cross-user disclosure through cross-origin redirects

CVE-2026-109829 · GHSA-4w7w-5xrc-9h26

When an originless Agent combined redirect and shared-cache interceptors as compose(redirect(), cache()), a response from a cross-origin redirect could be stored under the original URL. This could allow persistent cache poisoning or disclosure of user-specific responses to later callers. This release verifies the response origin before caching and preserves redirect-hop cache-control policy.

Denial of service through excessive Content-Encoding values

CVE-2026-109869 · GHSA-xjj6-f33q-929c

A malicious HTTP server could crash the Node.js process by returning more than five content codings and closing the connection before sending the body. Although fetch() rejected the response, an error from an orphaned internal stream could remain unhandled. This release validates the content-encoding chain before creating the body stream and aborts oversized chains safely.

Medium severity

Denial of service through the decompress interceptor

CVE-2026-87029 · GHSA-55wc-3pg8-jfw6

An exception thrown by a downstream response handler from an asynchronous decompression callback could escape as an uncaught exception. A server could trigger this when decompress was composed with a handler such as dump with a size limit. This release converts downstream handler exceptions into per-request errors.

Subresource Integrity bypass with non-lowercase algorithm tokens

CVE-2026-109841 · GHSA-f72v-6w45-q472

fetch() treated valid mixed-case or uppercase SRI algorithm tokens, such as SHA256, as unknown and could accept a response whose body did not match the configured digest. This release normalizes algorithm tokens before validation and digest selection.

Denial of service through unbounded EventSource parser state

CVE-2026-109924 · GHSA-4qv8-2p9j-2685

A malicious Server-Sent Events endpoint could exhaust process memory by sending many tiny data: fields without completing an event, or by splitting an unfinished line across many chunks. This release bounds retained EventSource parser state, including field counts, buffered chunks, unfinished-line length, and retained field data.

Denial of service through unbounded automatic WebSocket PONG buffering

CVE-2026-109932 · GHSA-9fm3-97px-rjf6

A malicious WebSocket server could exhaust process memory by flooding the client with PING frames while not reading the automatic PONG responses. undici previously ignored socket backpressure and allowed the outbound queue to grow without bound. This release pauses frame parsing when PONG writes encounter backpressure and resumes after the socket drains.

Full Changelog: nodejs/undici@v8.12.1...v8.12.2

v8.12.1

Compare Source

What's Changed

• fix: restore build:wasm npm script by @​mcollina in #​6009
• test: add unexpected disconnect guards to http2-body-delete.js by @​Kesavamoorthig06 in #​5970

New Contributors

• @​Kesavamoorthig06 made their first contribution in #​5970

Full Changelog: nodejs/undici@v8.12.0...v8.12.1

v8.12.0

Compare Source

What's Changed

• fix(cookies): ignore a numeric expires outside the Date range by @​xia-chao in #​5832
• fix(http2): pause bodyTimeout while applying backpressure by @​jasnell in #​5884
• fix(cache): track cached response abort state by @​mcollina in #​5820
• fix(deduplicate): make terminal callbacks exception-safe by @​mcollina in #​5838
• fix(decompress): stop inflating compress and x-compress by @​luantaraschi in #​5665
• fix(cache): evict least recently used entries in MemoryCacheStore by @​jasnell in #​5869
• fix(eventsource): fix redirect targets in eventsource by @​jasnell in #​5878
• fix(redirect): fix throwOnMaxRedirect edge by @​jasnell in #​5879
• fix: normalize HTTP/2 headers for legacy dispatch handlers by @​Knowzzz in #​5867
• fix(session cache): fix bug in tls session caching by @​jasnell in #​5882
• docs: fix relative links broken by the README move by @​v1teka in #​5843
• fix(redirect): add error code to max redirects error by @​mcollina in #​5895
• fix(eventsource): fix retry wrap bug by @​jasnell in #​5875
• fix(retry): keep request headers when resuming a download by @​jasnell in #​5870
• fix(proxyagent): correct handling of the host header by @​jasnell in #​5868
• fix(http1): fix handling of 204/304 responses by @​jasnell in #​5864
• test: add unexpected disconnect guards to two more h2 tests by @​zeexzeex in #​5825
• fix(cache): preserve 304 response event order with async stores by @​marcopiraccini in #​5797
• fix(dns): handle a null pick, and stop failing over to an expired record by @​datrixlab in #​5791
• fix: keep a header named proto across features by @​luantaraschi in #​5688
• ci: exclude tests from CodeQL analysis by @​mcollina in #​5905
• fix(pool): ensure that removed clients don't pick up requests by @​jasnell in #​5881
• feat: Added @​perseveranza-pets/milo as alternative experimental HTTP parser by @​ShogunPanda in #​5492
• extractBody fixes 2 by @​KhafraDev in #​5926
• reenable cachestorage wpts by @​KhafraDev in #​5907
• fix(fetch): parse language tag in filename* parameters by @​fallintoplace in #​5908
• fix(client): preserve tracked response header field boundaries by @​ronag in #​5940
• fix(http1): fixup strictContentLength handling by @​jasnell in #​5897
• feat(cache): compress big sqlite cache entries with zstd by @​mcollina in #​5744
• fix(eventsource): enforce maxEventSize on unterminated lines by @​mcollina in #​5814
• limit zstd window size to 8 MB by @​KhafraDev in #​5955
• test: add unexpected disconnect guards to http2-body.js by @​GhostCoder6969 in #​5914
• test: fix "specifiy" typo in cache interceptor test by @​ump45nose in #​5922
• Wpt/wpt runner fixes by @​KhafraDev in #​5959
• fix(h2): unref a session detached by GOAWAY with no open streams by @​kjsik11 in #​5960
• feat: Throw an error when WebAssembly is not available. by @​ShogunPanda in #​5966
• chore: Vendor milo 0.9.0. by @​ShogunPanda in #​5954
• build(deps-dev): bump ws from 8.21.3 to 8.22.0 by @​dependabot[bot] in #​5968
• build(deps-dev): bump undici from 6.28.0 to 6.29.0 by @​dependabot[bot] in #​5933
• fix(typemap): .md -> .html by @​avivkeller in #​5602
• build(deps): bump js-yaml from 4.1.1 to 4.3.2 by @​dependabot[bot] in #​5810
• build(deps): bump brace-expansion by @​dependabot[bot] in #​5934
• build(deps-dev): bump fast-check from 4.10.1 to 4.10.2 by @​dependabot[bot] in #​5921
• test(fetch): settle h2 internal stream errors by @​Yahiro025 in #​5927
• docs(errors): clarify timeout error codes and related options by @​theamodhshetty in #​4856
• fix(interceptor): limit response error body size by @​mcollina in #​5942
• build(deps): bump codecov/codecov-action from 7.0.0 to 7.1.1 by @​dependabot[bot] in #​5946
• build(deps): bump hendrikmuhs/ccache-action from 1.2.23 to 1.2.24 by @​dependabot[bot] in #​5951
• build(deps): bump github/codeql-action/analyze from 4.37.9 to 4.38.2 by @​dependabot[bot] in #​5952
• build(deps): bump github/codeql-action/autobuild from 4.37.9 to 4.38.2 by @​dependabot[bot] in #​5950
• build(deps): bump github/codeql-action/init from 4.37.9 to 4.38.2 by @​dependabot[bot] in #​5948
• build(deps): bump github/codeql-action/upload-sarif from 4.37.9 to 4.38.2 by @​dependabot[bot] in #​5947
• build(deps): bump actions/checkout from 7.0.0 to 7.0.1 by @​dependabot[bot] in #​5630
• fix(http1): reset connections for no-body transfer encoding by @​mcollina in #​5941
• fix: exclude experimental milo from node.js core bundle by @​mcollina in #​5935
• test: re-enable HTTP/2 churn test on Node.js 26 by @​mcollina in #​5961
• test: keep the h2c unix socket path within sun_path limits by @​mcollina in #​5978
• fix(cache): preserve abort reasons after completion by @​domenic in #​5958
• test: update milo paths in bundle-parser test by @​mcollina in #​5979
• fix(cache): always treat zero-lifetime entries as stale by @​mcollina in #​5980
• build(deps): bump step-security/harden-runner from 2.21.0 to 2.21.1 by @​dependabot[bot] in #​5949
• fix(websocket,eventsource): keep receive limits behind dispatcher wrappers by @​jasnell in #​5896
• fix(http2): enforce max concurrent streams by @​jasnell in #​5885
• docs: sync WG collaborators with nodejs/undici team by @​mcollina in #​5991
• build(deps-dev): bump @​fastify/busboy from 3.2.2 to 3.2.3 by @​dependabot[bot] in #​6005
• fix: ignore missing release ref during cleanup by @​mcollina in #​5891
• fix: reject unsupported FormData request bodies by @​mcollina in #​5913
• split wpt out of npm test by @​mcollina in #​5588

New Contributors

• @​xia-chao made their first contribution in #​5832
• @​jasnell made their first contribution in #​5884
• @​Knowzzz made their first contribution in #​5867
• @​v1teka made their first contribution in #​5843
• @​datrixlab made their first contribution in #​5791
• @​fallintoplace made their first contribution in #​5908
• @​GhostCoder6969 made their first contribution in #​5914
• @​ump45nose made their first contribution in #​5922

Full Changelog: nodejs/undici@v8.11.2...v8.12.0

v8.11.2

Compare Source

What's Changed

• fix: close rejected HTTP/2 WebSocket handshake streams by @​mcollina in #​5873
• fix: avoid reconnecting aborted requests by @​Junaid-PK in #​5846

New Contributors

• @​Junaid-PK made their first contribution in #​5846

Full Changelog: nodejs/undici@v8.11.1...v8.11.2

v8.11.1

Compare Source

What's Changed

• deslopify websocket test by @​KhafraDev in #​5851
• Revert "fix: preserve HTTP/2 for legacy fetch consumers" by @​mcollina in #​5860
• fix websocketstream bugs by @​KhafraDev in #​5863
• fix hang on 3xx response with large body by @​KhafraDev in #​5850
• docs: warn about buffering response bodies by @​mcollina in #​5872
• test: cover native fetch gzip decoding through the legacy bridge by @​mcollina in #​5874

Full Changelog: nodejs/undici@v8.11.0...v8.11.1

v8.11.0

Compare Source

What's Changed

• fix: complete upgrade diagnostics lifecycle by @​BridgeAR in #​5761
• build(deps): bump step-security/harden-runner from 2.19.4 to 2.21.0 by @​dependabot[bot] in #​5753
• fix(decompress): join a repeated content-encoding header by @​luantaraschi in #​5664
• fix(cookies): keep a cookie named proto in getCookies by @​luantaraschi in #​5663
• build(deps-dev): bump jest from 30.5.0 to 30.5.1 by @​dependabot[bot] in #​5784
• build(deps): bump got from 15.1.0 to 16.0.0 in /benchmarks by @​dependabot[bot] in #​5785
• fix: selectively re-enable SIMD for ppc64 by @​richardlau in #​5776
• use private fields for brand checks by @​KhafraDev in #​5792
• fix(h2): do not unref a session with open streams by @​kjsik11 in #​5782
• fix(h2): avoid pool fan-out during ALPN negotiation by @​mcollina in #​5799
• fix issue #​5715 by @​KhafraDev in #​5805
• ci: extend macOS Node.js workflow timeout by @​mcollina in #​5775
• fix(env-http-proxy-agent): NO_PROXY wildcard semantics by @​mcollina in #​5777
• fix(h2): do not replay a request whose response already started after GOAWAY by @​kjsik11 in #​5788
• test: skip HTTP/2 churn test on Node.js 25 on all platforms by @​kjsik11 in #​5790
• fix(proxy-agent): preserve repeated iterable headers by @​GiHoon1123 in #​5779
• docs(errors): document ProxyConnectionError (UND_ERR_PRX_CONN) by @​kilisamemarisaaa in #​5781
• dataurl parsing improvements + update WPT by @​KhafraDev in #​5812
• fix(decompress): treat inherited Object.prototype names as unsupported encodings by @​NgoQuocViet2001 in #​5807
• test(h2): stabilize http2-connection by @​ViniciusDev26 in #​5801
• fix: preserve HTTP/2 for non-upgrade legacy requests by @​mcollina in #​5811
• fix: skip drain dispatch for clientTtl-evicted clients in PoolBase by @​vwong in #​5677
• chore: update tests blocking release by @​vwong in #​5828
• build(deps): bump uWebSockets.js from v20.68.0 to v20.70.0 in /benchmarks by @​dependabot[bot] in #​5824
• fix(deduplicate): settle requests when composed with retry by @​mcollina in #​5817
• fix(cache): do not report aborted on successful cache hits by @​Yahiro025 in #​5819
• fix(cookies): keep an Expires of 0 when serializing a cookie by @​NgoQuocViet2001 in #​5808
• fix: honor backpressure in decompression interceptor by @​mcollina in #​5829
• fix(h2): validate h2Options.maxConcurrentStreams itself by @​kjsik11 in #​5830
• test(fetch): make pull-dont-push exceed any socket buffer by @​kjsik11 in #​5840
• test(decompress): wait for highWaterMark via readable instead of setImmediate loop by @​kjsik11 in #​5841
• fix(h2): keep the session ref'd while requests are queued by @​kjsik11 in #​5839
• fix cache.addAll and cache.add hanging by @​KhafraDev in #​5844
• fix(retry): settle responses after connection close by @​mcollina in #​5815
• fix(h2): validate response content-length by @​mcollina in #​5816
• fix(redirect): ignore informational responses in history by @​mcollina in #​5813
• fix(websocket): reset the compressed flag when a message completes by @​askalf in #​5827
• fix(h2): keep queued requests alive when the last stream closes by @​kjsik11 in #​5847
• build(deps-dev): bump jest from 30.5.1 to 30.5.2 by @​dependabot[bot] in #​5854
• build(deps-dev): bump fast-check from 4.9.0 to 4.10.1 by @​dependabot[bot] in #​5852
• build(deps): bump uWebSockets.js from v20.70.0 to v20.71.0 in /benchmarks by @​dependabot[bot] in #​5856
• build(deps-dev): bump @​metcoder95/https-pem from 1.0.0 to 1.0.1 by @​dependabot[bot] in #​5853

New Contributors

• @​luantaraschi made their first contribution in #​5664
• @​kilisamemarisaaa made their first contribution in #​5781
• @​NgoQuocViet2001 made their first contribution in #​5807
• @​ViniciusDev26 made their first contribution in #​5801
• @​vwong made their first contribution in #​5677
• @​Yahiro025 made their first contribution in #​5819
• @​askalf made their first contribution in #​5827

Full Changelog: nodejs/undici@v8.10.2...v8.11.0

v8.10.2

Compare Source

⚠️ Security fixes

High severity

• GHSA-vp8m-p9jh-q5pm: cache and deduplication interceptors could use caller-controlled request metadata instead of the authoritative dispatcher origin, enabling cross-origin cache poisoning and data disclosure. Undici now derives interceptor identities from the dispatcher origin and bypasses origin-dependent interceptors when no authoritative origin exists. Fixed by caf6194d.
• GHSA-w293-vg96-wgc3: BalancedPool could drop function-valued connection options while cloning its configuration, including custom TLS certificate validation callbacks. Undici now preserves connect and legacy tls options when creating upstreams. Fixed by 8f5868fb.
• GHSA-rfgv-xxqx-mfg5: a WebSocket server could select a subprotocol when none was requested, causing an uncaught TypeError that could terminate the process. Undici now rejects the handshake with protocol error 1002. Fixed by 66e12816.

Medium severity

• GHSA-3wwx-pv8p-q78v: a malformed permessage-deflate payload exceeding the configured decompression limit could emit an unhandled zlib error and terminate the process. Undici now destroys the inflater after reaching the limit. Fixed by 4411a238.
• GHSA-rx4f-c7p8-82vq: an unclean WebSocketStream close could create an unobserved rejected promise when its writable stream was locked, potentially terminating the process. Undici now propagates the failure through the retained writable stream controller. Fixed by 662d0ea6.
• GHSA-2jfj-6hjv-fm6j: shared caches could store and replay responses containing Set-Cookie, disclosing one user's cookies to another caller. Undici now excludes these responses from shared caches, including existing entries and revalidation paths. Fixed by cb75bbb3.
• GHSA-3xpg-4rpp-hhhm: the decompression interceptor did not bound decoded output, allowing compressed responses to consume excessive memory. Undici now limits every decompression stage to 64 MiB by default and supports a configurable maxSize. Fixed by 7aac7f12.
• GHSA-pmjh-fq2x-6v4x: a terminal retry failure after response headers were exposed could orphan the original response body, causing consumers to hang indefinitely. Undici now propagates the terminal error to the exposed body. Fixed by e905b5b8.

Low severity

• GHSA-8436-99hf-9mmv: cache interceptors could store and replay responses to unsafe HTTP methods such as POST or DELETE. Undici now restricts cache reads and writes to safe methods while preserving invalidation by successful unsafe requests. Fixed by 2be07bf9.
• GHSA-2gqq-gqf2-x968: the dump interceptor could treat an oversized chunked response as successfully truncated when no Content-Length was present. Undici now enforces maxSize against received bytes and aborts oversized responses. Fixed by 6d583124.
• GHSA-r53p-7pc4-xj5r: the retry interceptor could concatenate a resumed response with inconsistent framing into downstream output, enabling response splitting or corruption. Undici now validates Content-Range against the original response framing before resuming. Fixed by 0160a719.

What's Changed

• build(deps-dev): bump undici from 6.27.0 to 6.28.0 by @​dependabot[bot] in #​5653
• build(deps-dev): bump jest from 30.4.2 to 30.5.0 by @​dependabot[bot] in #​5750
• build(deps): bump github/codeql-action/analyze from 4.37.3 to 4.37.9 by @​dependabot[bot] in #​5752
• build(deps): bump github/codeql-action/upload-sarif from 4.36.2 to 4.37.9 by @​dependabot[bot] in #​5754
• test(h2): cover stream reset with NGHTTP2_INTERNAL_ERROR by [@​zeexzeex](https://redirect.github.co

[!IMPORTANT]
✂ PR body was truncated to here.