CVE-2026-3644

A control character validation flaw has been discovered in the Python http.cookie module. The Morsel.update(), |= operator, and unpickling paths were not patched to resolve CVE-2026-0672, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.