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Vulnerability details: VCID-3t6s-s89g-1ff3
Vulnerability ID VCID-3t6s-s89g-1ff3
Aliases CVE-2023-22485
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 4.8
Risk 2.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
epss 0.00071 https://api.first.org/data/v1/epss?cve=CVE-2023-22485
epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2023-22485
epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2023-22485
epss 0.00175 https://api.first.org/data/v1/epss?cve=CVE-2023-22485
cvssv3.1 5.3 https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr
ssvc Track https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2023-22485
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-22485
1033110 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033110
1033111 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033111
1033112 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033112
1033113 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033113
GHSA-c944-cv5f-hpvr https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2025-03-10T21:02:09Z/ Found at https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr
Exploit Prediction Scoring System (EPSS)
Percentile 0.21819
EPSS Score 0.00071
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T17:29:32.735236+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2023/22xxx/CVE-2023-22485.json 38.6.0