{"schema_version":"1.9.0","id":"BIT-libpython-2026-6019","published":"2026-06-25T07:36:30.325Z","modified":"2026-09-10T16:01:13.167182999Z","aliases":["BIT-python-2026-6019","BIT-python-min-2026-6019","CVE-2026-6019","PSF-2026-21"],"summary":"BaseCookie.js_output() does not neutralize embedded characters","details":"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 base64-encodes the cookie value to disallow escaping using cookie value.","affected":[{"package":{"name":"libpython","ecosystem":"Bitnami","purl":"pkg:bitnami/libpython"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.13.14"},{"introduced":"3.14.0"},{"fixed":"3.14.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/libpython/BIT-libpython-2026-6019.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}],"references":[{"type":"FIX","url":"https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c"},{"type":"FIX","url":"https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104"},{"type":"FIX","url":"https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8"},{"type":"EVIDENCE","url":"https://github.com/python/cpython/issues/90309"},{"type":"FIX","url":"https://github.com/python/cpython/pull/148848"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6019"}],"database_specific":{"cpes":["cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"],"severity":"Medium"}}