{"id":"CVE-2026-15308","aliases":["BIT-libpython-2026-15308","BIT-python-2026-15308","BIT-python-min-2026-15308","PSF-2026-33"],"url":"https://o3.security/vulnerability/CVE-2026-15308","summary":"Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations","details":"The incremental HTML parser (html.parser.HTMLParser) allows for CPU\ndenial-of-service through repeated unterminated markup declarations when\nprocessing uncontrolled data.","published":"2026-07-09T17:10:57.317Z","modified":"2026-08-26T10:27:35.411071524Z","cvss":null,"epss":{"score":0.00637,"percentile":0.4777,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":{"url":"https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9","label":"python/cpython@07efb08"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/07/09/4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15308.json"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15308"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/153030"},{"type":"FIX","url":"https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9"},{"type":"FIX","url":"https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7"},{"type":"FIX","url":"https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14"},{"type":"FIX","url":"https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced"},{"type":"FIX","url":"https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606"},{"type":"FIX","url":"https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00"},{"type":"FIX","url":"https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd"},{"type":"FIX","url":"https://github.com/python/cpython/pull/153031"},{"type":"PACKAGE","url":"https://github.com/python/cpython"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-26T10:27:35.411071524Z"}}