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Medium, CVSS 6.5amended

mkdocs-include-markdown-plugin susceptible to unvalidated input colliding with substitution placeholders

CVE-2025-59940GHSA-v39m-5m9j-m9w9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (mkdocs-include-markdown-plugin 7.1.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
EPSS
  • CVE-2025-59940: 0.34% estimated exploitation activity in the next 30 days; percentile 27.70 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact CWE-20: Improper Input Validation Low impact Patches Patched in v7.1.8 (commit https://github.com/mondeja/mkdocs-include-markdown-plugin/commit/7466d67aa0de8ffbc427204ad2475fed07678915) Workarounds No

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-v39m-5m9j-m9w9

  2. Revision 1 · created ·

    Published from osv record GHSA-v39m-5m9j-m9w9

Agent brief

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# Patch Next advisory brief: CVE-2025-59940

Advisory: mkdocs-include-markdown-plugin susceptible to unvalidated input colliding with substitution placeholders
IDs: CVE-2025-59940, GHSA-v39m-5m9j-m9w9
Record: https://patchnext.com/advisories/cve-2025-59940 (revision 2, source checked 26 Oct 2026, 13:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: mkdocs-include-markdown-plugin 7.1.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI mkdocs-include-markdown-plugin: affected < 7.1.8; fixed in 7.1.8

## Suggested inspection (read-only)
- `python -m pip show mkdocs-include-markdown-plugin`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on mkdocs-include-markdown-plugin.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-v39m-5m9j-m9w9 (OSV record GHSA-v39m-5m9j-m9w9 lists affected ranges: PyPI mkdocs-include-markdown-plugin >=0 <7.1.8 (fixed))
- Verified: https://github.com/advisories/GHSA-v39m-5m9j-m9w9 (GitHub-reviewed advisory GHSA-v39m-5m9j-m9w9 lists affected ranges: PyPI mkdocs-include-markdown-plugin >=0 <7.1.8)

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