CVE-2026-0672
CVE-2026-0672 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-93.
Key facts
- Severity: Medium (CVSS 4.0 base score 6.0)
- EPSS exploit prediction: 0% (32nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-3521
- Weakness: CWE-93
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-0672?
- 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.
- How severe is CVE-2026-0672?
- CVE-2026-0672 has a CVSS 4.0 base score of 6.0, rated medium severity.
- Is CVE-2026-0672 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-0672?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-0672 have an EU (EUVD) identifier?
- Yes. CVE-2026-0672 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3521.
- When was CVE-2026-0672 published?
- CVE-2026-0672 was published on 2026-01-20 and last updated on 2026-06-17.
References
- https://github.com/python/cpython/commit/62700107418eb2cca3fc88da036a243ea975f172
- https://github.com/python/cpython/commit/712452e6f1d4b9f7f8c4c92ebfcaac1705faa440
- https://github.com/python/cpython/commit/7852d72b653fea0199acf5fc2a84f6f8b84eba8d
- https://github.com/python/cpython/commit/918387e4912d12ffc166c8f2a38df92b6ec756ca
- https://github.com/python/cpython/commit/95746b3a13a985787ef53b977129041971ed7f70
- https://github.com/python/cpython/commit/b1869ff648bbee0717221d09e6deff46617f3e85
- https://github.com/python/cpython/issues/143919
- https://github.com/python/cpython/pull/143920
- https://mail.python.org/archives/list/[email protected]/thread/6VFLQQEIX673KXKFUZXCUNE5AZOGZ45M/
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