CVE-2026-46338 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-46338MEDIUM

facelessuser pymdown-extensions — PyMdown Extensions: Regression in pymdownx.snippets reintroduces sibling-prefix path traversal bypass despite restrict_base_path

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  L  N  N    4.3   .0031   23.7     —

AFFECTED
  Product             Versions                Fixed
  pymdown-extensions  >= 10.0.1, < 10.21.3 –  —

TIMELINE
  May 13  Reserved by GitHub_M
  Jul 16  EXPLOIT PUBLISHED — CVE-2026-46338 (facelessuser pymdown-extensions). Public exploit reference added.
  Jul 16  Published (CNA: GitHub_M)

CWE-22 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. From 10.0.1 until 10.21.3, pymdownx.snippets uses a string-prefix containment check in SnippetPreprocessor.get_snippet_path() in pymdownx/snippets.py when `restrict_base_path: True`, allowing markdown snippet directives to read files from sibling paths that share the same base_path prefix, such as docs and docs_internal. This is a regression of CVE-2023-32309. This issue is fixed in version 10.21.3.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 13, 2026	Reserved	Reserved by GitHub_M
July 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-46338 (facelessuser pymdown-extensions). Public exploit reference added.
July 16, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
facelessuser	pymdown-extensions	—	>= 10.0.1, < 10.21.3	—

Weaknesses

CWE-22

References (3)

https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c [Patch]
https://github.com/facelessuser/pymdown-extensions/releases/tag/10.21.3 [Product, Release Notes]
https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-46338 at cve.org

Vendors: facelessuser

Weaknesses: CWE-22

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-46338 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 Wednesday, August 19, 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.