← CVE Radar
CVE-2026-15308Incremental 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.
8.7 HIGHEPSS 0.63%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.7 | HIGH | 4.0PSF (CNA) | 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 |
| 7.5 | HIGH | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-15308
- Status
- Analyzed
- Assigner (CNA)
- PSF
- Published
- Jul 9, 2026
- Last modified
- 2026-10-25 17:10 UTC
- Weaknesses
Affected Products
As published by the CNA in the CVE record.
Python Software FoundationCPython6 version ranges
- before 3.10.21
- 3.11.0 before 3.11.16
- 3.12.0 before 3.12.14
- 3.13.0 before 3.13.15
- 3.14.0 before 3.14.7
- 3.15.0a1 before 3.15.0b4
References
- github.com https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9
- github.com https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7
- github.com https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14
- github.com https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced
- github.com https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606
- github.com https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00
- github.com https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd
- github.com https://github.com/python/cpython/issues/153030
- github.com https://github.com/python/cpython/pull/153031
- mail.python.org https://mail.python.org/archives/list/[email protected]/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/
- openwall.com http://www.openwall.com/lists/oss-security/2026/07/09/4