CVE-2023-22486

cmark-gfm Quadratic complexity bug in handle_close_bracket may lead to a denial of service

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

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.

cmark-gfm es la bifurcación de GitHub de cmark, una librería y programa de análisis y representación de CommonMark en C. Las versiones anteriores a 0.29.0.gfm.7 contienen un problema de complejidad de tiempo polinomial en handle_close_bracket que puede provocar un agotamiento ilimitado de los recursos y una posterior denegación de servicio. Esta vulnerabilidad ha sido parcheada en 0.29.0.gfm.7.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

Poc

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2022-12-29 CVE Reserved
2023-01-24 CVE Published
2025-03-10 CVE Updated
2025-03-10 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-407: Inefficient Algorithmic Complexity

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://github.com/github/cmark-gfm/security/advisories/GHSA-r572-jvj2-3m8p	2025-03-10

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Github Search vendor "Github"		Cmark-gfm Search vendor "Github" for product "Cmark-gfm"				< 0.29.0.gfm.7 Search vendor "Github" for product "Cmark-gfm" and version " < 0.29.0.gfm.7"		-		Affected