[commonmarker] Several quadratic complexity bugs may lead to denial of service in Commonmarker

Impact

Several quadratic complexity bugs in commonmarker’s underlying cmark-gfm library may lead to unbounded resource exhaustion and subsequent denial of service.

The following vulnerabilities were addressed:

• CVE-2023-22483
• CVE-2023-22484
• CVE-2023-22485
• CVE-2023-22486

For more information, consult the release notes for version 0.23.0.gfm.7.

Mitigation

Users are advised to upgrade to commonmarker version 0.23.7.

References

• https://github.com/gjtorikian/commonmarker/security/advisories/GHSA-636f-xm5j-pj9m
• https://github.com/advisories/GHSA-636f-xm5j-pj9m