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GeezerVison is showing github.com — [3.15] gh-161569: Check cookie policy before deleting expired cookies in `http.cookiejar` (GH-161570) by miss-islington · Pull Request #161579 · 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 …
236e6ef 
…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
This was referenced Nov 7, 2026
http.cookiejar deletes cookies of other domains via expired Set-Cookie [CVE-2026-124249] #161569
Open
gh-161569: Check cookie policy before deleting expired cookies in http.cookiejar #161570
Merged
@bedevere-app bedevere-app Bot added the type-security A security issue label Nov 7, 2026
@Eclips4
Eclips4 merged commit 4e9d037 into python:3.15 Nov 7, 2026
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@bedevere-app bedevere-app Bot removed the awaiting review label Nov 7, 2026
@miss-islington
miss-islington deleted the backport-8eb3d2c-3.15 branch November 7, 2026 21:56
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@miss-islington @Eclips4
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