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Vulnerability · Published Jan 24, 2023 · Assigned by GitHub_M

CVE-2023-22485cmark-gfm out-of-bounds read in validate_protocol

Medium 5.3

In plain English

A medium-severity out-of-bounds read in cmark-gfm from github. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.7%top 45.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior 0.29.0.gfm.7, a crafted markdown document can trigger an out-of-bounds read in the `validate_protocol` function. We believe this bug is harmless in practice, because the out-of-bounds read accesses `malloc` metadata without causing any visible damage.This vulnerability has been patched in 0.29.0.gfm.7.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12cmark-gfmno fix listedDEBIAN-CVE-2023-22485
Debian:13cmark-gfm0.29.0.gfm.13-1DEBIAN-CVE-2023-22485
Debian:14cmark-gfm0.29.0.gfm.13-1DEBIAN-CVE-2023-22485
Debian:12python-cmarkgfmno fix listedDEBIAN-CVE-2023-22485
Debian:13python-cmarkgfm2024.11.20-1DEBIAN-CVE-2023-22485
Debian:14python-cmarkgfm2024.11.20-1DEBIAN-CVE-2023-22485
Debian:12r-cran-commonmarkno fix listedDEBIAN-CVE-2023-22485
Debian:13r-cran-commonmark1.9.0-1DEBIAN-CVE-2023-22485
Debian:14r-cran-commonmark1.9.0-1DEBIAN-CVE-2023-22485
Debian:12ruby-commonmarkerno fix listedDEBIAN-CVE-2023-22485
Debian:13ruby-commonmarker0.23.10-1DEBIAN-CVE-2023-22485
Debian:14ruby-commonmarker0.23.10-1DEBIAN-CVE-2023-22485
Ubuntu:22.04:LTScmark-gfmno fix listedUBUNTU-CVE-2023-22485
Ubuntu:24.04:LTScmark-gfmno fix listedUBUNTU-CVE-2023-22485

Affected products (as reported)

VendorProductVersions
github cmark-gfm < 0.29.0.gfm.7

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References