CVE-2025-69534 (GCVE-0-2025-69534)

Vulnerability from cvelistv5 – Published: 2026-03-05 00:00 – Updated: 2026-06-30 12:06
VLAI
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • n/a
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-617 - Reachable Assertion
Assigner
References
URL Tags
https://github.com/Python-Markdown/markdown/issues/1534
https://github.com/Python-Markdown/markdown
https://github.com/Python-Markdown/markdown/actio…
http://www.openwall.com/lists/oss-security/2026/03/06/4
https://access.redhat.com/security/cve/CVE-2025-69534 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2444839 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:13512 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14874 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13508 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14873 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14835 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20677 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19155 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20674 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20676 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19366 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:9742 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13826 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10184 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8     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
 Create a notification for this product.
Red Hat Red Hat Satellite 6.16 for RHEL 8     cpe:/a:redhat:satellite:6.16::el8
    cpe:/a:redhat:satellite_capsule:6.16::el8
    cpe:/a:redhat:satellite_utils:6.16::el8
 Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9     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
 Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9     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
 Create a notification for this product.
Red Hat Red Hat Satellite 6.16 for RHEL 9     cpe:/a:redhat:satellite:6.16::el9
    cpe:/a:redhat:satellite_capsule:6.16::el9
    cpe:/a:redhat:satellite_utils:6.16::el9
 Create a notification for this product.
Red Hat Red Hat Satellite 6.17 for RHEL 9     cpe:/a:redhat:satellite:6.17::el9
    cpe:/a:redhat:satellite_capsule:6.17::el9
    cpe:/a:redhat:satellite_utils:6.17::el9
 Create a notification for this product.
Red Hat Red Hat Satellite 6.18 for RHEL 9     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
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux BaseOS (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.4)     cpe:/o:redhat:rhel_eus:9.4::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.6)     cpe:/o:redhat:rhel_eus:9.6::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
Red Hat Red Hat Developer Hub 1.8     cpe:/a:redhat:rhdh:1.8::el9
 Create a notification for this product.
Red Hat Red Hat Developer Hub 1.9     cpe:/a:redhat:rhdh:1.9::el9
 Create a notification for this product.
Red Hat Red Hat OpenShift AI 2.25     cpe:/a:redhat:openshift_ai:2.25::el9
 Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
 Create a notification for this product.
Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
 Create a notification for this product.
Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
 Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 10     cpe:/a:redhat:ansible_automation_platform:2.6::el10
    cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10
 Create a notification for this product.
Red Hat External Secrets Operator for Red Hat OpenShift     cpe:/a:redhat:external_secrets_operator:1
 Create a notification for this product.
Red Hat Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
 Create a notification for this product.
Red Hat Red Hat OpenShift Dev Spaces     cpe:/a:redhat:openshift_devspaces:3
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\"name\": \"RHBZ#2444839\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-69534.json\", \"tags\": [\"x_sadp-csaf-vex\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13512\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14874\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13508\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14873\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14835\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:20677\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": 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      "cveMetadata": "{\"cveId\": \"CVE-2025-69534\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-30T12:06:17.806Z\", \"dateReserved\": \"2026-01-09T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2026-03-05T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.