PT-2026-57132 · Git · Cpython

Published 2026-07-09 · Updated 2026-07-09

OSV

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

Related Identifiers

PSF-2026-33

Affected Products

Cpython

References · 8

• https://osv.dev/vulnerability/PSF-2026-33 · Vendor Advisory
• https://github.com/python/cpython/pull/153031 · Note
• https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd · Note
• https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9 · Note
• https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606 · Note
• https://github.com/python/cpython/issues/153030 · Note
• https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced · Note
• https://mail.python.org/archives/list/[e-mail]/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5 · Note