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CVE-2026-0672
Header injection in http.cookies.Morsel
Medium6.0EPSS 0.48%
- Published
- Updated
- Reserved
- Assigned by
- PSF
Description
When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| PSFCNA (assigner) | 4.0 | Medium6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N |
| NVDNVD · Deferred | 4.0 | Medium6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/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)
- 0.48% · top 58% of all CVEs (6 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 6.0.
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 (9)
- https://github.com/python/cpython/pull/143920 (opens in a new tab)patch
- https://github.com/python/cpython/issues/143919 (opens in a new tab)issue-tracking
- https://mail.python.org/archives/list/[email protected]/thread/6VFLQQEIX673KXKFUZXCUNE5AZOGZ45M/ (opens in a new tab)vendor-advisory
- https://github.com/python/cpython/commit/95746b3a13a985787ef53b977129041971ed7f70 (opens in a new tab)patch
- https://github.com/python/cpython/commit/712452e6f1d4b9f7f8c4c92ebfcaac1705faa440 (opens in a new tab)patch
- https://github.com/python/cpython/commit/62700107418eb2cca3fc88da036a243ea975f172 (opens in a new tab)patch
- https://github.com/python/cpython/commit/7852d72b653fea0199acf5fc2a84f6f8b84eba8d (opens in a new tab)patch
- https://github.com/python/cpython/commit/918387e4912d12ffc166c8f2a38df92b6ec756ca (opens in a new tab)patch
- https://github.com/python/cpython/commit/b1869ff648bbee0717221d09e6deff46617f3e85 (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-2026-0672)Record last updated .