What is CVE-2023-22486?

CVE-2023-22486 is a low-severity vulnerability in GitHub Cmark-Gfm, classified under Uncontrolled Resource Consumption. CVSS score: 3.5/10. Published 2023-01-26.

How severe is CVE-2023-22486?

Low severity. CVSS v3 base score is 3.5 out of 10.

Resource exhaustion in GitHub Cmark-Gfm

CVE-2023-22486

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. Versions prior to 0.29.0.gfm.7 contain a polynomial time complexity issue in handle_close_bracket that may lead to unbounded resource exhaustion and subsequent denial of service. This vulnerability has been patched in 0.29.0.gfm.7.

Vulnerability class: DoS (Denial of Service)

Published 2023-01-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.011 (64.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

GitHub Cmark-Gfm — versions < 0.29.0.gfm.7

Weakness classification (CWE)

References

github.com/github/cmark-gfm/security/advisories/GHSA-r572-jvj2-3m8p (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-22486?: CVE-2023-22486 is a low-severity vulnerability in GitHub Cmark-Gfm, classified under Uncontrolled Resource Consumption. CVSS score: 3.5/10. Published 2023-01-26.
How severe is CVE-2023-22486?: Low severity. CVSS v3 base score is 3.5 out of 10.