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CVE-2026-0865
wsgiref.headers.Headers allows header newline injection
Medium5.9EPSS 0.55%
- Published
- Updated
- Reserved
- Assigned by
- PSF
Description
User-controlled header names and values containing newlines can allow injecting HTTP headers.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| PSFCNA (assigner) | 4.0 | Medium5.9 | 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 |
| NVDNVD · Deferred | 4.0 | Medium5.9 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.55% · top 54% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
Python Software Foundation · CPython
- affected < 3.10.20
- affected 3.11.0 – < 3.11.15
- affected 3.12.0 – < 3.12.13
- affected 3.13.0 – < 3.13.12
- affected 3.14.0 – < 3.14.3
- affected 3.15.0a1 – < 3.15.0a6
References (15)
- https://github.com/python/cpython/pull/143917 (opens in a new tab)patch
- https://github.com/python/cpython/issues/143916 (opens in a new tab)issue-tracking
- https://mail.python.org/archives/list/[email protected]/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/ (opens in a new tab)vendor-advisory
- https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58 (opens in a new tab)patch
- https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510 (opens in a new tab)patch
- https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5 (opens in a new tab)patch
- https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211 (opens in a new tab)patch
- https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2 (opens in a new tab)patch
- https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995 (opens in a new tab)patch
- https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6 (opens in a new tab)patch
- https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff (opens in a new tab)patch
- https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf (opens in a new tab)patch
- https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f (opens in a new tab)patch
- https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97 (opens in a new tab)patch
- https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219 (opens in a new tab)patch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-0865)Record last updated .