CVSS 4.0
5.9 mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NCVE-2026-0865
User-controlled header names and values containing newlines can allow injecting HTTP headers.
Severity
- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-31)
- CWE
- CWE-74
- Published
- Modified
- Record from
- the NVD, synced
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