CVE-2026-15308
Published: July 10, 2026Last modified: July 14, 2026
Description
The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | python3 | Fixed (3.11.15-r6) |
| 25 LTS | python3 | Fixed (3.12.13-r6) | |
| Stream | python3 | Fixed (3.14.5-r5) | |
| Hardened Containers | 23 LTS | python3 | Fixed (3.11.15-r6) |
| 25 LTS | python3 | Fixed (3.12.13-r6) | |
| Stream | python3 | Fixed (3.14.5-r5) |
References
- http://www.openwall.com/lists/oss-security/2026/07/09/4
- https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9
- https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14
- https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced
- https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606
- https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd
- https://github.com/python/cpython/issues/153030
- https://github.com/python/cpython/pull/153031
- https://mail.python.org/archives/list/[email protected]/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/