{"id":"CVE-2026-16052","summary":"Cookie Attribute Injection via Unescaped Semicolons in http.cookies.Morsel","details":"The http.cookies.Morsel class allows separator semicolons in attribute\nvalues\nand includes them verbatim in all output formats. An attacker who can\ncontrol\nthese values could use this to relax the cookie's Domain or SameSite\nrestrictions.","modified":"2026-11-13T02:47:25.685777436Z","published":"2026-11-12T16:28:03.251Z","database_specific":{"cna_assigner":"PSF","cwe_ids":["CWE-74"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16052.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16052.json"},{"type":"PACKAGE","url":"https://github.com/python/cpython"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/161707"},{"type":"FIX","url":"https://github.com/python/cpython/pull/161711"},{"type":"WEB","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/IZL4QUFV7PKGT2JYSU2DCBMLTWYJDGKZ/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16052"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"22d79d9840a275ed6ed36cd590dc74edc61765fb"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"3.16.0"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}}],"versions":["v3.15.0b1","v3.15.0a8","v3.15.0a7","v3.15.0a6","v3.15.0a5","v3.15.0a4","v3.15.0a3","v3.15.0a2","v3.15.0a1","v3.14.0b1","v3.14.0a7","v3.14.0a6","v3.14.0a5","v3.14.0a4","v3.14.0a3","v3.14.0a2","v3.14.0a1","v3.13.0b1","v3.13.0a6","v3.13.0a5","v3.13.0a4","v3.13.0a3","v3.13.0a2","v3.13.0a1","v3.12.0b1","v3.12.0a7","v3.12.0a6","v3.12.0a5","v3.12.0a4","v3.12.0a3","v3.12.0a2","v3.12.0a1","v3.11.0b1","v3.11.0a7","v3.11.0a6","v3.11.0a5","v3.11.0a4","v3.11.0a3","v3.10.0a7","v3.10.0a1","v3.9.0a2","v3.7.0a2","v3.6.0b1","v3.6.0a3","v3.5.0b1","v3.5.0a4","v3.5.0a3","v3.5.0a2","v3.5.0a1","v3.4.0b3","v3.4.0b2","v3.4.0b1","v3.4.0a4","v3.4.0a3","v3.4.0a2","v3.4.0a1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.3.0b2","v3.3.0b1","v3.3.0a4","v3.3.0a3","v3.3.0a2","v3.2rc3","v3.2rc2","v3.2rc1","v3.2b2","v3.2b1","v3.2a4","v3.2a3","v3.2a2","v3.2a1","v3.1","v3.1rc2","v3.1rc1","v3.1b1","v3.1a2","v3.1a1","v3.0rc3","v3.0rc2","v3.0rc1","v3.0b3","v3.0b2","v3.0b1","v3.0a5","v3.0a4","v3.0a3","v3.0a2","v3.0a1","v2.4","v2.4c1","v2.4b2","v2.4b1","v2.4a3","v2.4a2","v2.4a1","v2.3c2","v2.3c1","v2.2a3","v2.1","v2.1c2","v2.1c1","v2.1b2","v2.1b1","v2.1a2","v2.1a1","v2.0","v2.0c1","v2.0b2","v2.0b1","v1.6a2","v1.6a1","v1.5.2","v1.5.2c1","v1.5.2b2","v1.5.2b1","v1.5.2a2","v1.5.2a1","v1.5.1","v1.5","v1.5b2","v1.5b1","v1.5a4","v1.5a3","v1.5a2","v1.5a1","v1.4","v1.4b3","v1.4b2","v1.4b1","v1.3","v1.3b1","v1.2","v1.2b4","v1.2b3","v1.2b2","v1.2b1","v1.1.1","v1.1","v1.0.2","v1.0.1","v0.9.9","v0.9.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16052.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}