CVE-2025-69534

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 55% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

Published

March 5, 2026

Last Modified

September 7, 2026

Advisory Details (10)

Auto-updated Jul 2, 2026
Patch available. Sources: redhat.
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:14873
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:14835
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13826
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13512
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13508
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10184
generic

oss-security - CVE-2025-69534 in Python-Markdown

http://www.openwall.com/lists/oss-security/2026/03/06/4
generic

Security: CVE-2025-69534 – Remote DoS via malformed <![ sequence in Python-Markdown 3.8 · Issue #1534 · Python-Markdown/markdown · GitHub

https://github.com/Python-Markdown/markdown/issues/1534
generic

Bump version to 3.8.1 · Python-Markdown/markdown@3870f20 · GitHub

https://github.com/Python-Markdown/markdown/actions/runs/15736122892
generic

GitHub - Python-Markdown/markdown: A Python implementation of John Gruber’s Markdown with Extension support. · GitHub

https://github.com/Python-Markdown/markdown

Vendor Advisories for CVE-2025-69534(14)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(13)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.13+esm24) @ xenial2026-09-07ubuntu
ubuntupython3.14-venv (3.14.4-1ubuntu0.1) @ resolute2026-09-07ubuntu
redhatpython-markdown-0:3.5.1-6.el10_0.12026-05-26redhat
redhatpython-markdown-0:3.3.4-4.el9_6.22026-05-26redhat
redhatpython-markdown-0:3.3.4-4.el9_4.22026-05-26redhat
redhatpython-markdown-0:3.3.4-4.el9_8.22026-05-19redhat
redhatpython-markdown-0:3.5.1-6.el10_2.12026-05-19redhat
redhatpython-markdown-0:3.8.2-1.el9pc2026-05-07redhat
redhatpython3.12-markdown-0:3.8.2-1.el9pc2026-05-07redhat
redhatrhdh/rhdh-hub-rhel9:17779032622026-05-05redhat
redhatpython3.12-markdown-0:3.10.2-1.el9ap2026-05-04redhat
redhatrhoai/odh-training-rocm62-torch25-py311-rhel9:17762722532026-04-23redhat
redhatrhdh/rhdh-hub-rhel9:17767842862026-04-22redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(10 across 5 ecosystems)
Debian:11(3)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions)
  • every version on: no fix on record
—
python2.72.7.18-10 ... 2.7.18-9 (10 versions)
  • every version on: no fix on record
—
python3.93.9.10-1 ... 3.9.9-4 (29 versions)
  • every version on: no fix on record
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.11+dfsg-2 ... 8.0.0+dfsg-1 (31 versions)
  • every version on: no fix on record
—
python3.113.11.2-6 ... 3.11.9-1 (28 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.19+dfsg-2 ... 8.0.0+dfsg-1 (13 versions)
  • every version on: no fix on record
—
python3.13—
  • every version up to 3.13.4-1: fixed in 3.13.4-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.19+dfsg-2 ... 7.3.23+dfsg-2 (12 versions)
  • every version up to 8.0.0+dfsg-1: fixed in 8.0.0+dfsg-1
—
python3.13—
  • every version up to 3.13.4-1: fixed in 3.13.4-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
markdown1.7 ... 3.8 (54 versions)
  • every version up to 3.8.1: fixed in 3.8.1
  • every version through 3.8: no fix on record
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 178 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-03 14:25 UTCEPSS rescore
  3. 2026-10-01 19:49 UTCEPSS rescore
  4. 2026-10-01 19:49 UTCEPSS rescore
  5. 2026-09-30 15:02 UTCEPSS rescore
  6. 2026-09-29 15:20 UTCEPSS rescore
  7. 2026-09-28 13:50 UTCEPSS rescore
  8. 2026-09-27 04:45 UTCOSV refresh
  9. 2026-09-26 15:58 UTCEPSS rescore
  10. 2026-09-24 14:02 UTCEPSS rescore
  11. 2026-09-23 13:47 UTCEPSS rescore
  12. 2026-09-20 20:15 UTCEPSS rescore
  13. 2026-09-18 19:27 UTCEPSS rescore
  14. 2026-09-17 19:30 UTCEPSS rescore
  15. 2026-09-16 14:07 UTCEPSS rescore
  16. 2026-09-16 05:14 UTCEPSS rescore
  17. 2026-09-15 03:10 UTCEPSS rescore
  18. 2026-09-13 16:46 UTCEPSS rescore
  19. 2026-09-12 15:00 UTCEPSS rescore
  20. 2026-09-11 14:52 UTCEPSS rescore
  21. 2026-09-11 09:36 UTCEPSS rescore
  22. 2026-09-10 09:34 UTCEPSS rescore
  23. 2026-09-08 22:00 UTCEPSS rescore
  24. 2026-09-07 16:00 UTCEPSS rescore
  25. 2026-09-07 14:03 UTCEG score recompute
Show 75 more
  1. 2026-09-07 14:03 UTCVendor advisory
  2. 2026-09-06 13:47 UTCEPSS rescore
  3. 2026-09-04 05:06 UTCEPSS rescore
  4. 2026-09-03 00:00 UTCOSV refresh
  5. 2026-09-02 14:11 UTCEPSS rescore
  6. 2026-09-01 13:53 UTCEPSS rescore
  7. 2026-08-30 01:21 UTCEPSS rescore
  8. 2026-08-28 21:40 UTCEPSS rescore
  9. 2026-08-27 14:24 UTCEPSS rescore
  10. 2026-08-26 14:45 UTCEPSS rescore
  11. 2026-08-25 13:48 UTCEPSS rescore
  12. 2026-08-24 14:16 UTCEPSS rescore
  13. 2026-08-23 00:18 UTCEPSS rescore
  14. 2026-08-21 23:48 UTCEPSS rescore
  15. 2026-08-20 22:55 UTCEPSS rescore
  16. 2026-08-19 17:03 UTCEPSS rescore
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-17 13:46 UTCEPSS rescore
  19. 2026-08-16 14:55 UTCEPSS rescore
  20. 2026-08-16 12:26 UTCEG score recompute
  21. 2026-08-16 12:26 UTCVendor advisory
  22. 2026-08-16 02:14 UTCEPSS rescore
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 20:49 UTCVendor advisory
  25. 2026-08-14 08:23 UTCEG score recompute
  26. 2026-08-14 08:23 UTCVendor advisory
  27. 2026-08-13 22:00 UTCEPSS rescore
  28. 2026-08-12 23:59 UTCEG score recompute
  29. 2026-08-12 23:59 UTCVendor advisory
  30. 2026-08-12 13:50 UTCEPSS rescore
  31. 2026-08-11 22:59 UTCEG score recompute
  32. 2026-08-11 22:59 UTCVendor advisory
  33. 2026-08-11 13:42 UTCEPSS rescore
  34. 2026-08-11 05:30 UTCEG score recompute
  35. 2026-08-11 05:30 UTCVendor advisory
  36. 2026-08-10 23:59 UTCEPSS rescore
  37. 2026-08-10 07:29 UTCVendor advisory
  38. 2026-08-09 19:45 UTCEG score recompute
  39. 2026-08-09 19:45 UTCVendor advisory
  40. 2026-08-09 13:46 UTCEPSS rescore
  41. 2026-08-09 08:02 UTCEG score recompute
  42. 2026-08-09 08:02 UTCVendor advisory
  43. 2026-08-08 16:36 UTCEPSS rescore
  44. 2026-08-08 07:26 UTCVendor advisory
  45. 2026-08-07 19:43 UTCEG score recompute
  46. 2026-08-07 19:43 UTCVendor advisory
  47. 2026-08-07 16:27 UTCEPSS rescore
  48. 2026-08-06 13:46 UTCEPSS rescore
  49. 2026-08-06 02:31 UTCEG score recompute
  50. 2026-08-06 02:31 UTCVendor advisory
  51. 2026-08-05 19:17 UTCEPSS rescore
  52. 2026-08-04 10:37 UTCEPSS rescore
  53. 2026-08-04 02:12 UTCEG score recompute
  54. 2026-08-04 02:12 UTCVendor advisory
  55. 2026-08-03 10:35 UTCEPSS rescore
  56. 2026-08-02 18:43 UTCEG score recompute
  57. 2026-08-02 18:43 UTCVendor advisory
  58. 2026-08-02 02:26 UTCEPSS rescore
  59. 2026-08-01 04:15 UTCEPSS rescore
  60. 2026-07-30 16:27 UTCEPSS rescore
  61. 2026-07-30 01:30 UTCEPSS rescore
  62. 2026-07-27 14:13 UTCEPSS rescore
  63. 2026-07-26 14:54 UTCEPSS rescore
  64. 2026-07-26 14:54 UTCEPSS rescore
  65. 2026-07-25 14:17 UTCEPSS rescore
  66. 2026-07-25 14:17 UTCEPSS rescore
  67. 2026-07-24 14:17 UTCEPSS rescore
  68. 2026-07-23 14:18 UTCEPSS rescore
  69. 2026-07-23 14:18 UTCEPSS rescore
  70. 2026-07-23 03:02 UTCEG score recompute
  71. 2026-07-22 14:08 UTCEPSS rescore
  72. 2026-07-21 15:24 UTCEPSS rescore
  73. 2026-07-20 17:08 UTCEPSS rescore
  74. 2026-07-19 14:30 UTCEPSS rescore
  75. 2026-07-19 14:30 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-69534?
CVE-2025-69534 is a high vulnerability published on March 5, 2026. 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…
When was CVE-2025-69534 disclosed?
CVE-2025-69534 was first published on March 5, 2026, with the most recent update on September 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-69534 actively exploited?
CVE-2025-69534 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-69534?
CVE-2025-69534 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2025-69534?
A fix for CVE-2025-69534 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-69534 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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