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Advisory record · GHSA-9xwg-3r6f-jcx2

PyMdown Extensions: Path traversal in the b64 extension lets <img src> read files outside base_path

CVSS 5.3 MediumEPSS 0.0042 · 36th percentile

Published by the GitHub Advisory Database at 24 Jul 2026, 16:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pymdown-extensionsPyPI<11.0.011.0.0
Identifiers
GHSA-9xwg-3r6f-jcx2 · CVE-2026-61632 · PYSEC-2026-3609
Weakness (CWE)
CWE-22
Tags
Published
24 Jul 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Affected versions of pymdown-extensions before 11.0.0 let a crafted image src in Markdown read image-type files (.png, .jpg, .jpeg, .gif, .svg) outside the configured base_path when the b64 extension is enabled. The file contents are embedded base64-encoded in the rendered output, so an attacker who can supply Markdown to a renderer with b64 enabled can disclose those files. Upgrade to pymdown-extensions 11.0.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0042, the 36th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.