Red Hat Security Advisory: python3.12 security update
Description
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * python: Python: CPU Denial of Service in HTML parser via repeated unterminated markup declarations (CVE-2026-15308) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
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Weaknesses
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Technical Analysis
The advisory addresses CVE-2026-15308, a denial of service vulnerability in the Python 3.14 HTML parser component. The flaw arises from repeated unterminated markup declarations that can cause excessive CPU consumption. The update includes patched RPM packages for python3.14 and related components for Red Hat Hardened Images on aarch64 and x86_64 architectures. The vulnerability is rated as high severity by Red Hat Product Security. The advisory provides detailed package versions and references for applying the update.
Potential Impact
Successful exploitation of this vulnerability can lead to a denial of service condition by causing high CPU usage in the Python HTML parser. This may affect applications or services relying on the vulnerable python3.14 packages, potentially leading to service disruption or degraded performance. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A patch is available for this vulnerability. Users should apply the updated python3.14 packages (version 3.14.6-1.3.hum1) provided by Red Hat for the affected architectures. Detailed instructions for applying the update are available at https://images.redhat.com/ and https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:37535
- Cve Count
- 1
- State
- PUBLISHED
Threat ID: 6a50ba2e68715ace4357ce84
Added to database: 07/10/2026, 09:23:58 UTC
Last enriched: 08/16/2026, 17:38:41 UTC
Last updated: 10/07/2026, 06:48:14 UTC
Views: 176
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