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.

CVSS

No CVSS.

References

Link	Resource
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/security-announce@python.org/thread/6VFLQQEIX673KXKFUZXCUNE5AZOGZ45M/

Configurations

No configuration.

History

No history.

Information

Published : 2026-01-20 22:15

Updated : 2026-01-26 15:16

NVD link : CVE-2026-0672

Mitre link : CVE-2026-0672

CVE.ORG link : CVE-2026-0672

JSON object : View

Products Affected

No product.

CWE

CWE-93

Improper Neutralization of CRLF Sequences ('CRLF Injection')

{"id": "CVE-2026-0672", "cveTags": [], "metrics": {"cvssMetricV40": [{"type": "Secondary", "source": "cna@python.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.0, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-01-20T22:15:52.680", "references": [{"url": "https://github.com/python/cpython/commit/62700107418eb2cca3fc88da036a243ea975f172", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/712452e6f1d4b9f7f8c4c92ebfcaac1705faa440", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/7852d72b653fea0199acf5fc2a84f6f8b84eba8d", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/918387e4912d12ffc166c8f2a38df92b6ec756ca", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/95746b3a13a985787ef53b977129041971ed7f70", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/b1869ff648bbee0717221d09e6deff46617f3e85", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/issues/143919", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/pull/143920", "source": "cna@python.org"}, {"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/6VFLQQEIX673KXKFUZXCUNE5AZOGZ45M/", "source": "cna@python.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cna@python.org", "description": [{"lang": "en", "value": "CWE-93"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-01-26T15:16:07.033", "sourceIdentifier": "cna@python.org"}