// For flags

CVE-2023-22483

cmark-gfm Quadratic complexity bugs may lead to a denial of service

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*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 are subject to several polynomial time complexity issues in cmark-gfm that may lead to unbounded resource exhaustion and subsequent denial of service. Various commands, when piped to cmark-gfm with large values, cause the running time to increase quadratically. These vulnerabilities have been patched in version 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 están sujetas a varios problemas de complejidad de tiempo polinomial en cmark-gfm que pueden provocar un agotamiento ilimitado de los recursos y posterior denegación del servicio. Varios comandos, cuando se canalizan a cmak-gfm con valores grandes, hacen que el tiempo de ejecución aumente cuadráticamente. Estas vulnerabilidades se han solucionado en la versión 0.29.0.gfm.7.

It was discovered that cmark-gfm's autolink extension did not correctly handle parsing large inputs. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. It was discovered that cmark-gfm did not correctly handle parsing large inputs. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 24.10.

*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
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2022-12-29 CVE Reserved
  • 2023-01-23 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
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