CVE-2026-0865

wsgiref.headers.Headers allows header newline injection

CVSS 5.9 MEDIUMEPSS 0.5%CWE-74

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

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Affected products

Python Software Foundation · CPython

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References

https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58 https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510 https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2 https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5 https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6 https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97 https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219 https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995 https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211