Red Hat Security Advisory: python3.11 security update
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): * cpython: Excessive read buffering DoS in http.client (CVE-2025-13836) * cpython: python: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service (CVE-2025-12084) 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.
AI Analysis
Technical Summary
This advisory covers two denial of service vulnerabilities in the CPython implementation of Python 3.11 as packaged by Red Hat. CVE-2025-13836 is caused by excessive read buffering in the http.client module, which can be exploited to cause a denial of service. CVE-2025-12084 arises from a quadratic time complexity algorithm in xml.dom.minidom, which can also lead to denial of service conditions. Red Hat has released updated python3.11 packages for Red Hat Enterprise Linux 9 and its extended update support versions to address these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in applications using the affected Python modules. This may result in application or service unavailability. No evidence of exploitation in the wild is known at this time.
Mitigation Recommendations
Red Hat has released updated python3.11 packages that fix these vulnerabilities. Users of Red Hat Enterprise Linux 9 and related variants should apply the provided security update as described in the Red Hat advisory RHSA-2026:1410. No additional mitigation steps are indicated beyond applying the official update.
Red Hat Security Advisory: python3.11 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): * cpython: Excessive read buffering DoS in http.client (CVE-2025-13836) * cpython: python: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service (CVE-2025-12084) 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
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers two denial of service vulnerabilities in the CPython implementation of Python 3.11 as packaged by Red Hat. CVE-2025-13836 is caused by excessive read buffering in the http.client module, which can be exploited to cause a denial of service. CVE-2025-12084 arises from a quadratic time complexity algorithm in xml.dom.minidom, which can also lead to denial of service conditions. Red Hat has released updated python3.11 packages for Red Hat Enterprise Linux 9 and its extended update support versions to address these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in applications using the affected Python modules. This may result in application or service unavailability. No evidence of exploitation in the wild is known at this time.
Mitigation Recommendations
Red Hat has released updated python3.11 packages that fix these vulnerabilities. Users of Red Hat Enterprise Linux 9 and related variants should apply the provided security update as described in the Red Hat advisory RHSA-2026:1410. No additional mitigation steps are indicated beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:1410
- Cve Count
- 2
- Additional Cves
- ["CVE-2025-13836"]
Threat ID: 6a3da1c74853345fc1820d21
Added to database: 06/25/2026, 21:46:47 UTC
Last enriched: 06/25/2026, 21:59:15 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 28
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.