{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-124249", "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22", "state": "PUBLISHED", "assignerShortName": "PSF", "dateReserved": "2026-11-07T00:18:32.381Z", "datePublished": "2026-11-09T14:20:47.891Z", "dateUpdated": "2026-11-09T14:20:47.891Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "modules": ["http", "http.cookiejar"], "product": "CPython", "repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "versions": [{"lessThan": "3.16.0", "status": "affected", "version": "0", "versionType": "python"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Grant Abejar (https://github.com/vinzabe)"}, {"lang": "en", "type": "coordinator", "value": "Kirill Podoprigora (https://github.com/Eclips4)"}, {"lang": "en", "type": "remediation reviewer", "value": "Victor Stinner (https://github.com/vstinner)"}], "descriptions": [{"lang": "en", "supportingMedia": [{"type": "text/html", "value": "http.cookiejar.CookieJar deleted a stored cookie when a response carried an\nalready expired Set-Cookie header for it, using the Domain and Path\nattributes from the header without consulting the cookie policy. A server\ncould therefore delete cookies belonging to other domains from a shared\ncookie jar, such as the one used by urllib's HTTPCookieProcessor. The fix\nconsults the cookie policy before an expired cookie may delete an existing\none, as required by RFC 6265 section 5.3."}], "value": "http.cookiejar.CookieJar deleted a stored cookie when a response carried an\nalready expired Set-Cookie header for it, using the Domain and Path\nattributes from the header without consulting the cookie policy. A server\ncould therefore delete cookies belonging to other domains from a shared\ncookie jar, such as the one used by urllib's HTTPCookieProcessor. The fix\nconsults the cookie policy before an expired cookie may delete an existing\none, as required by RFC 6265 section 5.3."}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 6.3, "baseSeverity": "MEDIUM", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-346", "description": "CWE-346", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "28c92f92-d60d-412d-b760-e73465c3df22", "shortName": "PSF", "dateUpdated": "2026-11-09T14:20:47.891Z"}, "references": [{"tags": ["patch"], "url": "https://github.com/python/cpython/pull/161570"}, {"tags": ["issue-tracking"], "url": "https://github.com/python/cpython/issues/161569"}, {"tags": ["vendor-advisory"], "url": "https://mail.python.org/archives/list/[email protected]/thread/Y6IKNZ2VZUS2L6CLQICSFUEMCLT7OLTY/"}], "source": {"discovery": "UNKNOWN"}, "title": "`http.cookiejar` applies expired `Set-Cookie` to cookie store before policy validation"}}}

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