CVE-2026-15308Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations

Descripción

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/ vendor-advisoryMailing List
• https://github.com/python/cpython/pull/153031 patchIssue TrackingPatch
• https://github.com/python/cpython/issues/153030 issue-trackingPatch
• https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9 patchPatch
• https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced patchPatch
• https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606 patchPatch
• https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd patchPatch
• https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14 patchPatch
• https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7 patchPatch
• https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00 patchPatch
• http://www.openwall.com/lists/oss-security/2026/07/09/4 Third Party Advisory