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Vulnerability IntelligencePSF-2026-6

PSF-2026-6

UNKNOWN

User-controlled header names and values containing newlines can allow injecting HTTP headers.

Published Jan 20, 2026

Modified 1 weeks ago

Fix available

Details

User-controlled header names and values containing newlines can allow injecting HTTP headers.

Affected Packages

Python

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

3.10.203.11.153.12.133.13.123.14.33.15.0a6

References

FIX

https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58

FIX

https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510

FIX

https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f

FIX

https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2

FIX

https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5

FIX

https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6

FIX

https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff

FIX

https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97

FIX

https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf

FIX

https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219

FIX

https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995

FIX

https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211

REPORT

https://github.com/python/cpython/issues/143916

WEB

https://github.com/python/cpython/pull/143917

ADVISORY

https://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/

Aliases

CVE-2026-0865

Ecosystems(20)

Windows 10 (1507)Windows 10 (1607) / Server 2016 Windows 10 (1809) / Server 2019 Windows 10 (1903)Windows 10 (1909)

Timeline

PublishedJan 20, 2026

ModifiedMar 3, 2026

PSF-2026-6 | Mondoo Vulnerability Intelligence