Bug 2444839 (CVE-2025-69534)

Summary: CVE-2025-69534 python-markdown: denial of service via malformed HTML-like sequences
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: abarbaro, alcohan, alizardo, anthomas, caswilli, dschmidt, ehelms, erezende, ggainey, gparvin, jbalunas, jchui, jhe, jkoehler, jlanda, jmitchel, juwatts, kaycoth, kshier, ktsao, lphiri, mhulan, nboldt, nmoumoul, osousa, pahickey, pcreech, psrna, rchan, rhaigner, sdawley, simaishi, smallamp, smcdonal, stcannon, teagle, tmalecek, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in Python-Markdown. Parsing crafted markdown content containing malformed HTML-like sequences causes html.parser.HTMLParser to raise an unhandled AssertionError. This unhandled exception allows an attacker to cause an application crash and potentially disclose sensitive information via its stack trace.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2444869    
Bug Blocks:    

Description OSIDB Bzimport 2026-03-05 16:01:33 UTC
Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandled AssertionError during Markdown parsing. Because Python-Markdown does not catch this exception, any application that processes attacker-controlled Markdown may crash. This enables remote, unauthenticated Denial of Service in web applications, documentation systems, CI/CD pipelines, and any service that renders untrusted Markdown. The issue was acknowledged by the vendor and fixed in version 3.8.1. This issue causes a remote Denial of Service in any application parsing untrusted Markdown, and can lead to Information Disclosure through uncaught exceptions.

Comment 3 errata-xmlrpc 2026-05-04 13:58:46 UTC
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.6 for RHEL 10
  Red Hat Ansible Automation Platform 2.6 for RHEL 9

Via RHSA-2026:13508 https://access.redhat.com/errata/RHSA-2026:13508

Comment 4 errata-xmlrpc 2026-05-04 14:15:40 UTC
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.5 for RHEL 9
  Red Hat Ansible Automation Platform 2.5 for RHEL 8

Via RHSA-2026:13512 https://access.redhat.com/errata/RHSA-2026:13512

Comment 6 errata-xmlrpc 2026-05-07 17:26:25 UTC
This issue has been addressed in the following products:

  Red Hat Satellite 6.17 for RHEL 9

Via RHSA-2026:14873 https://access.redhat.com/errata/RHSA-2026:14873

Comment 7 errata-xmlrpc 2026-05-07 17:55:55 UTC
This issue has been addressed in the following products:

  Red Hat Satellite 6.16 for RHEL 8
  Red Hat Satellite 6.16 for RHEL 9

Via RHSA-2026:14874 https://access.redhat.com/errata/RHSA-2026:14874

Comment 8 errata-xmlrpc 2026-05-19 16:10:07 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19155 https://access.redhat.com/errata/RHSA-2026:19155

Comment 9 errata-xmlrpc 2026-05-19 21:40:47 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19366 https://access.redhat.com/errata/RHSA-2026:19366

Comment 10 errata-xmlrpc 2026-05-26 06:59:24 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:20677 https://access.redhat.com/errata/RHSA-2026:20677

Comment 11 errata-xmlrpc 2026-05-26 07:15:02 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:20674 https://access.redhat.com/errata/RHSA-2026:20674

Comment 12 errata-xmlrpc 2026-05-26 07:19:37 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:20676 https://access.redhat.com/errata/RHSA-2026:20676