CVE-2026-0865
wsgiref.headers.Headers allows header newline injection
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
User-controlled header names and values containing newlines can allow injecting HTTP headers.
| CWE | CWE-74 |
| Vendor | python software foundation |
| Product | cpython |
| Published | Jan 20, 2026 |
| Last Updated | Mar 3, 2026 |
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Affected Versions
Python Software Foundation / CPython
0 < 3.10.20 3.11.0 < 3.11.15 3.12.0 < 3.12.13 3.13.0 < 3.13.12 3.14.0 < 3.14.3 3.15.0a1 < 3.15.0a6
References
github.com: https://github.com/python/cpython/pull/143917 github.com: https://github.com/python/cpython/issues/143916 mail.python.org: https://mail.python.org/archives/list/[email protected]/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/ github.com: https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58 github.com: https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510 github.com: https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5 github.com: https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211 github.com: https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2 github.com: https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995 github.com: https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6 github.com: https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff github.com: https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf github.com: https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f github.com: https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97 github.com: https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219
Credits
🔍 Omar M. Hasan