CVE-2025-69534
Summary
| CVE | CVE-2025-69534 |
|---|---|
| State | PUBLISHED |
| Assigner | mitre |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-05 15:16:11 UTC |
| Updated | 2026-07-15 02:17:51 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.005660000 probability, percentile 0.432230000 (date 2026-07-18)
Problem Types: CWE-400 | CWE-617 | n/a | CWE-400 CWE-400 Uncontrolled Resource Consumption | CWE-617 Reachable Assertion
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | ADP | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | ADP | CVSS | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Python-markdown | Markdown | 3.8 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Na | N/a | affected n/a | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2.5 For RHEL 8 | unaffected 0:3.10.2-1.el8ap * rpm | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2.5 For RHEL 9 | unaffected 0:3.10.2-1.el9ap * rpm | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2.6 For RHEL 9 | unaffected 0:4.7.11-2.el9ap * rpm | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2.6 For RHEL 9 | unaffected 0:3.10.2-1.el9ap * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:3.5.1-6.el10_2.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 0:3.5.1-6.el10_0.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:3.3.4-4.el9_8.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 0:3.3.4-4.el9_4.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:3.3.4-4.el9_6.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Satellite 6.16 For RHEL 8 | unaffected 0:3.8.2-1.el8pc * rpm | Not specified |
| ADP | Red Hat | Red Hat Satellite 6.16 For RHEL 9 | unaffected 0:3.8.2-1.el9pc * rpm | Not specified |
| ADP | Red Hat | Red Hat Satellite 6.17 For RHEL 9 | unaffected 0:3.8.2-1.el9pc * rpm | Not specified |
| ADP | Red Hat | Red Hat Satellite 6.18 For RHEL 9 | unaffected 0:3.8.2-1.el9pc * rpm | Not specified |
| ADP | Red Hat | Red Hat Developer Hub 1.8 | unaffected 1776784286 * rpm | Not specified |
| ADP | Red Hat | Red Hat Developer Hub 1.9 | unaffected 1777903262 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 2.25 | unaffected 1776768939 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 2.25 | unaffected 1776243287 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 2.25 | unaffected 1776272253 * rpm | Not specified |
| ADP | Red Hat | External Secrets Operator For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | External Secrets Operator For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | External Secrets Operator For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | External Secrets Operator For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | Multicluster Engine For Kubernetes | Not specified | Not specified |
| ADP | Red Hat | Multicluster Engine For Kubernetes | Not specified | Not specified |
| ADP | Red Hat | Multicluster Engine For Kubernetes | Not specified | Not specified |
| ADP | Red Hat | Multicluster Engine For Kubernetes | Not specified | Not specified |
| ADP | Red Hat | Multicluster Engine For Kubernetes | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces | Not specified | Not specified |
| ADP | Red Hat | Red Hat Satellite 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Satellite 6 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:14835 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13512 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/06/4 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:20676 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:14874 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:20674 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13508 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10184 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/Python-Markdown/markdown/issues/1534 | [email protected] | github.com | Exploit, Issue Tracking |
| access.redhat.com/errata/RHSA-2026:14873 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:9742 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19366 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/Python-Markdown/markdown | [email protected] | github.com | Product |
| access.redhat.com/security/cve/CVE-2025-69534 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-69534.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13826 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19155 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/Python-Markdown/markdown/actions/runs/15736122892 | [email protected] | github.com | Product |
| access.redhat.com/errata/RHSA-2026:20677 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-03-05T16:01:10.432Z | Reported to Red Hat. |
| ADP | 2026-03-05T00:00:00.000Z | Made public. |
Solutions
ADP: RHSA-2026:13512: Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9
ADP: RHSA-2026:14874: Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9
ADP: RHSA-2026:13508: Red Hat Ansible Automation Platform 2.6 for RHEL 9
ADP: RHSA-2026:14873: Red Hat Satellite 6.17 for RHEL 9
ADP: RHSA-2026:14835: Red Hat Satellite 6.18 for RHEL 9
ADP: RHSA-2026:20677: Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
ADP: RHSA-2026:19155: Red Hat Enterprise Linux BaseOS (v. 10)
ADP: RHSA-2026:20674: Red Hat Enterprise Linux BaseOS EUS (v.9.4)
ADP: RHSA-2026:20676: Red Hat Enterprise Linux BaseOS EUS (v.9.6)
ADP: RHSA-2026:19366: Red Hat Enterprise Linux BaseOS (v. 9)
ADP: RHSA-2026:9742: Red Hat Developer Hub 1.8
ADP: RHSA-2026:13826: Red Hat Developer Hub 1.9
ADP: RHSA-2026:10184: Red Hat OpenShift AI 2.25
Workarounds
ADP: To mitigate this vulnerability, wrap your markdown parsing function in a try/except block. This catches the unhandled exception, preventing both the application crash and the stack trace leak.
There are currently no legacy QID mappings associated with this CVE.