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CVE-2026-3644

HIGH CVSS: 7.5 Published: 2026-03-16 Modified: 2026-08-13

Description

The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().

Affected Platforms

Python Python

Weakness Type

CWE-20, CWE-116

References