CVE-2023-37463

Quadratic complexity bugs may lead to a denial of service

HIGH
7.5
CVSS Score
Published: July 13, 2023 at 07:22 PM UTC
Updated: June 17, 2026 at 06:08 AM UTC
1 product affected across 1 vendorCmark Gfm

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cmark Gfm· GitHubgithub-action
95%
v < 0.29.0.gfm.12
Affected range stops below 0.29.0.gfm.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400NVD-CWE-noinfo

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