CVE-2025-68142

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 70% 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension (pymdownx.blocks.caption). In systems that take unchecked user content, this could cause long hanges when processing the data if a malicious payload was crafted. This issue is patched in Release 10.16.1. As a workaround, those who process unknown user content without timeouts or other safeguards in place to prevent really large, malicious content being aimed at systems may avoid the use of pymdownx.blocks.caption until they're able to upgrade.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

December 16, 2025

Last Modified

February 3, 2026

Advisory Details (3)

Auto-updated Aug 9, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
generic

Client Challenge

https://pypi.org/project/pymdown-extensions/10.16.1
github Patch Available🟡 PoC Available

ReDOS bug in Figure Capture extension · Advisory · facelessuser/pymdown-extensions · GitHub

https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-r6h4-mm7h-8pmq
github_commit Patch Available

commit b50d15a56850 (facelessuser/pymdown-extensions)

Patch available: facelessuser/pymdown-extensions 10.16.1 (contains commit b50d15a56850)

https://github.com/facelessuser/pymdown-extensions/commit/b50d15a56850ed1408a284bba81cc019c6bd72e8

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
pymdown-extensions10.13-110.13-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
pymdown-extensions10.13-1, 10.13-2, 10.13-310.13-4—
PyPI(1)
PackageVulnerable rangeFixed inDependents
pymdown-extensions1.0.0 ... 9.9.2 (106 versions)10.16.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× 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 148 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-17 19:30 UTCEPSS rescore
  3. 2026-09-16 14:07 UTCEPSS rescore
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  6. 2026-09-14 07:49 UTCOSV refresh
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  22. 2026-08-26 08:43 UTCOSV refresh
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  1. 2026-08-21 23:48 UTCEPSS rescore
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  13. 2026-08-09 23:33 UTCEG score recompute
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  19. 2026-08-06 08:50 UTCEG score recompute
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  25. 2026-07-30 16:27 UTCEPSS rescore
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  27. 2026-07-27 14:13 UTCEPSS rescore
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  35. 2026-07-23 12:19 UTCOSV refresh
  36. 2026-07-23 03:02 UTCEG score recompute
  37. 2026-07-22 14:08 UTCEPSS rescore
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  39. 2026-07-20 17:08 UTCEPSS rescore
  40. 2026-07-19 14:30 UTCEPSS rescore
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  60. 2026-07-06 07:32 UTCOSV refresh
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  73. 2026-06-28 04:56 UTCEPSS rescore
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  75. 2026-06-27 03:08 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-68142?
CVE-2025-68142 is a medium vulnerability published on December 16, 2025. PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension (pymdownx.blocks.caption). In systems that take unchecked user content, this could cause long hanges when processing the data if a…
When was CVE-2025-68142 disclosed?
CVE-2025-68142 was first published in the National Vulnerability Database on December 16, 2025, with the most recent update on February 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-68142 actively exploited?
CVE-2025-68142 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.2% of all scored CVEs.
What is the CVSS score of CVE-2025-68142?
CVE-2025-68142 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2025-68142?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-68142, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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