{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-3644","assignerOrgId":"28c92f92-d60d-412d-b760-e73465c3df22","state":"PUBLISHED","assignerShortName":"PSF","dateReserved":"2026-03-06T16:13:09.289Z","datePublished":"2026-03-16T17:37:31.344Z","dateUpdated":"2026-04-07T22:01:41.034Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","modules":["http.cookies"],"product":"CPython","repo":"https://github.com/python/cpython","vendor":"Python Software Foundation","versions":[{"version":"0","lessThan":"3.13.13","status":"affected","versionType":"python"},{"version":"3.14.0","lessThan":"3.14.4","status":"affected","versionType":"python"},{"version":"3.15.0a1","lessThan":"3.15.0a8","status":"affected","versionType":"python"}]}],"credits":[{"lang":"en","type":"coordinator","value":"Stan Ulbrych"},{"lang":"en","type":"remediation developer","value":"Stan Ulbrych"},{"lang":"en","type":"remediation reviewer","value":"Victor Stinner"},{"lang":"en","type":"remediation reviewer","value":"Seth Larson"},{"lang":"en","type":"reporter","value":"Vyom Yadav"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output()."}],"value":"The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output()."}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","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:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"providerMetadata":{"orgId":"28c92f92-d60d-412d-b760-e73465c3df22","shortName":"PSF","dateUpdated":"2026-04-07T22:01:41.034Z"},"references":[{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4"},{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/145599"},{"tags":["patch"],"url":"https://github.com/python/cpython/pull/145600"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd"}],"source":{"discovery":"UNKNOWN"},"title":"Incomplete control character validation in http.cookies","x_generator":{"engine":"Vulnogram 1.0.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-20","lang":"en","description":"CWE-20 Improper Input Validation"}]},{"descriptions":[{"type":"CWE","cweId":"CWE-116","lang":"en","description":"CWE-116 Improper Encoding or Escaping of Output"}]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-16T18:25:27.051552Z","id":"CVE-2026-3644","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-16T18:25:55.021Z"}}]}}