Integer overflow in cmark-gfm table parsing extension leads to heap memory corruption

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2024-22051: 1.45% estimated exploitation activity in the next 30 days; percentile 73.40 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact CommonMarker uses cmark-gfm for rendering Github Flavored Markdown. An integer overflow in cmark-gfm's table row parsing may lead to heap memory corruption when parsing tables who's marker rows contain more than UINT16MAX columns. The impact of this heap corruption ranges from Information Leak to Arbitrary Code Execution. If affected versions of CommonMarker are used for rendering remote user controlled markdown, this vulnerability may lead to Remote Code Execution (RCE). Patches This vulnerability has been patched in the following CommonMarker release: - v0.23.4 Workarounds The vulnerability exists in the table markdown extensions of cmark-gfm. Disabling any use of the table extension will prevent this vulnerability from being triggered. References - https://github.com/github/cmark-gfm/security/advisories/GHSA-mc3g-88wq-6f4x Acknowledgements We would like to thank Felix Wilhelm of Google's Project Zero for reporting this vulnerability For more information If you have any…

Published by the source

3 Mar 2022, 20:28 UTC

Last modified by the source

8 Jan 2024, 19:15 UTC

Source last checked

26 Oct 2026, 15:48 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-fmx4-26r3-wxpf

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-22051

Advisory: Integer overflow in cmark-gfm table parsing extension leads to heap memory corruption
IDs: CVE-2024-22051, GHSA-fmx4-26r3-wxpf
Record: https://patchnext.com/advisories/cve-2024-22051 (revision 1, source checked 26 Oct 2026, 15:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: commonmarker 0.23.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems commonmarker: affected < 0.23.4; fixed in 0.23.4

## Suggested inspection (read-only)
- RubyGems commonmarker: check the installed version with your package manager.

## 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 commonmarker.
- 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://github.com/advisories/GHSA-fmx4-26r3-wxpf (GitHub-reviewed advisory GHSA-fmx4-26r3-wxpf lists affected ranges: RubyGems commonmarker >=0 <0.23.4)

Commands are suggestions: review each one before running it.