CVE-2026-86433 commonmark 1.5.0 before 2.8.4 Denial of Service via Attributes

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 t...

CVE-2026-86433

commonmark (PHP Markdown parser) versions 1.5.0 through 2.8.3 contain a denial-of-service vulnerability in the Attributes extension . The root cause is that AttributesListener::findTargetAndDirection() performs quadratic-time sibling list scanning , allowing an unauthenticated attacker to submit ...

CVE-2026-86433: Inefficient Algorithmic Complexity

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 t...