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OpenAdvisories
Low · 2.3 CVE-2026-16052 EUVD-2026-124537GHSA-x8gr-g883-r98g

The http.cookies.Morsel class allows separator semicolons in attribute values and includes them verbatim in all output formats. An attacker…

Published Nov 12, 2026 · Assigned by PSF

Description

The http.cookies.Morsel class allows separator semicolons in attribute
values
and includes them verbatim in all output formats. An attacker who can
control
these values could use this to relax the cookie's Domain or SameSite
restrictions.

Affected products

VendorProductAffectedFixed
Python Software Foundation CPython 0 <3.16.0 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 python3 +1 No fix yet —

References