CVEvulnerability
CVE-2026-15308
8.7 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-09
- Last modified
- 2026-10-25
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 8.7 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400
Description
The incremental HTML parser (html.parser.HTMLParser) allows for CPU
denial-of-service through repeated unterminated markup declarations when
processing uncontrolled data.
Affected configurations
• python python (< 3.10.21)
• python python (>= 3.11.0 < 3.11.16)
• python python (>= 3.12.0 < 3.12.14)
• python python (>= 3.13.0 < 3.13.15)
• python python (>= 3.14.0 < 3.14.7)
• python python 3.15.0
Related
Weakness · CWE (1)
- CWE-400 Uncontrolled Resource Consumption weakness
References
- https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9 Patch
- https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7 Patch
- https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14 Patch
- https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced Patch
- https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606 Patch
- https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00 Patch
- https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd Patch
- https://github.com/python/cpython/issues/153030 Patch
- https://github.com/python/cpython/pull/153031 Issue Tracking, Patch
- https://mail.python.org/archives/list/[email protected]/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/ Mailing List
- http://www.openwall.com/lists/oss-security/2026/07/09/4 Third Party Advisory