Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations
The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-15308US | high7.5 | — | ||
The incremental HTML parser (html.parser.HTMLParser) allows for CPU
denial-of-service through repeated unterminated markup declarations when
processing uncontrolled data. | ||||
02
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/07/09/4ADVISORY
- https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9FIX
- https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7FIX
- https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14FIX
- https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969cedFIX
- https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606FIX
- https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00FIX
- https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bdFIX
scry
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