High severity7.5NVD Advisory· Published Sep 7, 2026

CVE-2026-86433

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Thephpleague/Commonmarkllm-fuzzy
Range: from 1.5.0 before 2.8.4

Patches

Vulnerability mechanics

References

github.com/thephpleague/commonmark/security/advisories/GHSA-g2gp-3wwq-f4phnvd
www.vulncheck.com/advisories/commonmark-1.5.0-before-2.8.4-denial-of-service-via-attributesnvd

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