{"id":"CVE-2026-6019","title":"http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes \" for JavaScript string context","summary":"http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes \" for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-150","CWE-116"],"vendor":"python","product":"python","affected":["python < 3.13.14","python >= 3.14.0, <= 3.14.4","python = 3.15.0"],"patched":["python 3.13.14"],"published":"2026-04-22","updated":"2026-07-27","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-6019","references":[{"url":"https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8","label":"cna@python.org"},{"url":"https://github.com/python/cpython/issues/90309","label":"cna@python.org"},{"url":"https://github.com/python/cpython/pull/148848","label":"cna@python.org"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/","label":"cna@python.org"}],"tags":["nvd"],"epss":0.00211,"epssPercentile":0.1162,"ingestedAt":"2026-07-27T18:22:57.927Z","slug":"CVE-2026-6019","body":"## Overview\n\nhttp.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes \" for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.\n\n## Affected\n\n- `python < 3.13.14`\n- `python >= 3.14.0, <= 3.14.4`\n- `python = 3.15.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `python 3.13.14`","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}