HIGH 8.7 NVD
CVE-2026-86433
commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Attributes extension where AttributesListener::findTargetAndDirecti
commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Attributes extension where AttributesListener::findTargetAndDirection() performs quadratic-time sibling list scanning. Unauthenticated attackers can submit approximately 32 KB of repeated attribute blocks to cause parsing to take over 5 seconds, exhausting server resources.
References
- https://github.com/thephpleague/commonmark/security/advisories/GHSA-g2gp-3wwq-f4ph
- https://www.vulncheck.com/advisories/commonmark-1.5.0-before-2.8.4-denial-of-service-via-a
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-09-07 via NVD.
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