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VULNERABILITIES

CVE-2026-15308 Details

Description

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

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
http://www.openwall.com/lists/oss-security/2026/07/09/4 CVEThird Party Advisory
https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9 [email protected]Patch
https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7 [email protected]Patch
https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14 [email protected]Patch
https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced [email protected]Patch

see all 11 references

Weakness Enumeration

CWE-IDCWE NameSource
NVD-CWE-noinfoInsufficient Information to Classify Weakness[email protected]
CWE-400Uncontrolled Resource Consumption[email protected]

Affected Products

ProductVersions
python python
< 3.10.21
>= 3.11.0, < 3.11.16
>= 3.12.0, < 3.12.14
>= 3.13.0, < 3.13.15
>= 3.14.0, < 3.14.7

CPE

  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha8:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:beta3:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

13 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-15308
NVD Published Date:
Jul 9, 2026
NVD Last Modified:
Aug 20, 2026
Source:
[email protected]
CVE-2026-15308 Details - Not Deferred