🛡️ BIT-libpython-2026-3644 — libpython

🟡 CVSS 5.0 — Medium ✅ No Known Exploit OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Incomplete control character validation in http.cookies

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 software

BIT-libpython-2026-3644 is recorded against 1 package.

  • libpython

Timeline and source

Published on 18 March 2026 and last revised on 27 March 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
mail.python.org (Web)
nvd.nist.gov (Web)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-03-18
Updated 2026-08-12
Modified 2026-03-27
Fix URL N/A

Affected Packages

Software From version Fixed in
libpython — —

More BIT LIBPYTHON 2026 advisories

Browse all of BIT LIBPYTHON 2026 in the advisory index.

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