7.5

CVE-2023-37463: github cmark-gfm Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighModified
AliasesDEBIAN-CVE-2023-37463openSUSE-SU-2026:12003-1
Published 13-07-2023Last modified 30-10-2024
Open JSON

Vulnerability summary

CVE-2023-37463 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in github cmark-gfm. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 52.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.70%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
UBUNTU-CVE-2023-37463

Timeline

  1. 13-07-2023
    PublishedVulnerability first disclosed.
  2. 30-10-2024
    Last modifiedVulnerability information updated.

Description

cmark-gfm is an extended version of the C reference implementation of CommonMark, a rationalized version of Markdown syntax with a spec. Three polynomial time complexity issues in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. These vulnerabilities have been patched in 0.29.0.gfm.12.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.70%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

0.00 pp

From 0.70% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.70%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Cmark Gfm

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian4 products
  • cmark-gfmAll versions (No fix recorded) | < 0.29.0.gfm.13-1
  • python-cmarkgfmAll versions (No fix recorded) | < 2024.11.20-1
  • r-cran-commonmarkAll versions (No fix recorded) | < 1.9.1-1
  • ruby-commonmarkerAll versions (No fix recorded) | < 0.23.10-1
Github1 product
Opensuse1 product
  • python-cmarkgfm&distro=openSUSE Tumbleweed< 2025.10.22-1.4

3 vendors · 6 products

References

4 links