#VU71459 Inefficient Algorithmic Complexity in cmark-gfm - CVE-2023-22486

Vulnerability identifier: #VU71459

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-22486

CWE-ID: CWE-407

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
cmark-gfm
Universal components / Libraries / Software for developers

Vendor: GitHub

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a polynomial time complexity issue in cmark-gfm in handle_close_bracket. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

cmark-gfm: 0.29.0.gfm.0 - 0.29.0.gfm.6

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External links
https://github.com/github/cmark-gfm/security/advisories/GHSA-r572-jvj2-3m8p

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.