Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2025-69534
n/a n/a — Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unha…
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0059 46.3 —
AFFECTED
Product Versions Fixed
n/a n/a – —
TIMELINE
Jan 9 Reserved by mitre
Mar 5 Published (CNA: mitre)
Sep 7 EXPLOIT PUBLISHED — CVE-2025-69534. Public exploit reference 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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| January 9, 2026 | Reserved | Reserved by mitre |
| March 5, 2026 | Published | Published (CNA: mitre) |
| September 7, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2025-69534. Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| n/a | n/a | — | n/a | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-69534 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
