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GeezerVison is showing github.com — [3.12] gh-161569: Check cookie policy before deleting expired cookies in `http.cookiejar` (GH-161570) by miss-islington · Pull Request #161582 · python/cpython

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@miss-islington

@miss-islington miss-islington commented Nov 7, 2026

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gh-161569: Check cookie policy before deleting expired cookies in http.cookiejar

An expired Set-Cookie header was allowed to delete a stored cookie using
the Domain and Path attributes taken verbatim from the header, before
CookiePolicy.set_ok() was consulted. A response from one host could
therefore delete cookies belonging to any other domain in a shared jar.

The policy is now consulted before an expired cookie may delete an
existing one, as required by RFC 6265 section 5.3.
(cherry picked from commit 8eb3d2c)

Co-authored-by: Kirill Podoprigora [email protected]
Co-authored-by: Victor Stinner [email protected]

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@Eclips4 @vstinner @miss-islington
pythongh-161569: Check cookie policy before deleting expired cookies …
3bb37d2 
…in `http.cookiejar` (pythonGH-161570)

pythongh-161569: Check cookie policy before deleting expired cookies in http.cookiejar

An expired Set-Cookie header was allowed to delete a stored cookie using
the Domain and Path attributes taken verbatim from the header, before
CookiePolicy.set_ok() was consulted. A response from one host could
therefore delete cookies belonging to any other domain in a shared jar.

The policy is now consulted before an expired cookie may delete an
existing one, as required by RFC 6265 section 5.3.
(cherry picked from commit 8eb3d2c)

Co-authored-by: Kirill Podoprigora <[email protected]>
Co-authored-by: Victor Stinner <[email protected]>
@bedevere-app bedevere-app Bot added the awaiting review label Nov 7, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Nov 7, 2026
http.cookiejar deletes cookies of other domains via expired Set-Cookie [CVE-2026-124249] #161569
Open
@bedevere-app bedevere-app Bot added the type-security A security issue label Nov 7, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Nov 7, 2026
gh-161569: Check cookie policy before deleting expired cookies in http.cookiejar #161570
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@Eclips4 Eclips4 assigned Yhg1s Nov 7, 2026
vstinner
vstinner approved these changes Nov 9, 2026
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LGTM. Automated backport.

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels Nov 9, 2026
@Eclips4 Eclips4 added the release-blocker label Nov 9, 2026
@github-project-automation github-project-automation Bot added this to Release and Deferred blockers 🚫 Nov 9, 2026
@github-project-automation github-project-automation Bot moved this to Todo in Release and Deferred blockers 🚫 Nov 9, 2026
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@vstinner vstinner vstinner approved these changes

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4 participants

@miss-islington @vstinner @Yhg1s @Eclips4
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