8.2
HIGH
CVSS 3.1
CVE-2025-69534
Python-Markdown HTML Injection Denial of Service
Overview
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.
Details
INFO
Published Date :
March 5, 2026, 3:16 p.m.
Last Modified :
July 15, 2026, 2:17 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
Update Python-Markdown to version 3.8.1 or later to fix denial-of-service and information disclosure vulnerabilities.
- Update Python-Markdown to version 3.8.1.
- Ensure Markdown parsing exceptions are handled.
- Avoid parsing untrusted Markdown content.
- Monitor application logs for parsing errors.
Public PoC/Exploit Available at Github
CVE-2025-69534 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-69534.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-69534 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-69534
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Dockerfile Shell Python
Updated: 3 weeks, 4 days ago
0 stars
0 fork
0 watcher
Born at : May 16, 2026, 7:36 a.m.
This repo has been linked 1 different CVEs too.
None
Python Dockerfile Shell JavaScript HTML CSS
Updated: 4 months, 3 weeks ago
0 stars
0 fork
0 watcher
Born at : March 5, 2026, 10:51 p.m.
This repo has been linked 10 different CVEs too.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-69534 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-69534 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
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'rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-pipeline-runtime-tensorflow-rocm-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-training-cuda121-torch24-py311-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-training-cuda128-torch28-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-training-rocm62-torch24-py311-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-training-rocm64-torch28-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-vllm-gaudi-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift:4'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Container Platform 4', 'packageName': 'openshift4/ose-agent-installer-api-server-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift:4'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Container Platform 4', 'packageName': 'openshift4/ose-olm-catalogd-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'packageName': 'devspaces/traefik-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'packageName': 'satellite:el8/python-markdown', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'packageName': 'satellite/iop-advisor-backend-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:ansible_automation_platform:2.5::el8', 'cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8', 'cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2.5 for RHEL 8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:satellite:6.16::el8', 'cpe:/a:redhat:satellite_capsule:6.16::el8', 'cpe:/a:redhat:satellite_utils:6.16::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6.16 for RHEL 8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2.5::el9', 'cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9', 'cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2.5 for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2.6::el9', 'cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9', 'cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2.6 for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:satellite:6.16::el9', 'cpe:/a:redhat:satellite_capsule:6.16::el9', 'cpe:/a:redhat:satellite_utils:6.16::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6.16 for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:satellite:6.17::el9', 'cpe:/a:redhat:satellite_capsule:6.17::el9', 'cpe:/a:redhat:satellite_utils:6.17::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6.17 for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:satellite:6.18::el9', 'cpe:/a:redhat:satellite_capsule:6.18::el9', 'cpe:/a:redhat:satellite_maintenance:6.18::el9', 'cpe:/a:redhat:satellite_utils:6.18::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6.18 for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux_eus:10.0'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux BaseOS EUS (v. 10.0)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10.2'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux BaseOS (v. 10)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:rhel_eus:9.4::baseos'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux BaseOS EUS (v.9.4)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:rhel_eus:9.6::baseos'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux BaseOS EUS (v.9.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:9::baseos'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux BaseOS (v. 9)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.8::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.9::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai:2.25::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI 2.25', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift:4'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Container Platform 4', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2.6::el10', 'cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2.6 for RHEL 10', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:external_secrets_operator:1'], 'vendor': 'Red Hat', 'product': 'External Secrets Operator for Red Hat OpenShift', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 6', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H Added CWE CWE-617 Added Reference https://access.redhat.com/errata/RHSA-2026:10184 Added Reference https://access.redhat.com/errata/RHSA-2026:13508 Added Reference https://access.redhat.com/errata/RHSA-2026:13512 Added Reference https://access.redhat.com/errata/RHSA-2026:13826 Added Reference https://access.redhat.com/errata/RHSA-2026:14835 Added Reference https://access.redhat.com/errata/RHSA-2026:14873 Added Reference https://access.redhat.com/errata/RHSA-2026:14874 Added Reference https://access.redhat.com/errata/RHSA-2026:19155 Added Reference https://access.redhat.com/errata/RHSA-2026:19366 Added Reference https://access.redhat.com/errata/RHSA-2026:20674 Added Reference https://access.redhat.com/errata/RHSA-2026:20676 Added Reference https://access.redhat.com/errata/RHSA-2026:20677 Added Reference https://access.redhat.com/errata/RHSA-2026:9742 Added Reference https://access.redhat.com/security/cve/CVE-2025-69534 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2444839 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-69534.json -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'n/a', 'product': 'n/a', 'versions': [{'status': 'affected', 'version': 'n/a'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-69534', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-03-12T16:17:53.202491Z'} -
Initial Analysis by [email protected]
Mar. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:python-markdown:markdown:3.8:*:*:*:*:python:*:* Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/03/06/4 Types: Mailing List, Third Party Advisory Added Reference Type MITRE: https://github.com/Python-Markdown/markdown Types: Product Added Reference Type MITRE: https://github.com/Python-Markdown/markdown/actions/runs/15736122892 Types: Product Added Reference Type MITRE: https://github.com/Python-Markdown/markdown/issues/1534 Types: Exploit, Issue Tracking -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 12, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Mar. 06, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/03/06/4 -
New CVE Received by [email protected]
Mar. 05, 2026
Action Type Old Value New Value Added 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. Added Reference https://github.com/Python-Markdown/markdown Added Reference https://github.com/Python-Markdown/markdown/actions/runs/15736122892 Added Reference https://github.com/Python-Markdown/markdown/issues/1534
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.