What is GHSA-f9pm-gcpp-fwjp?

GHSA-f9pm-gcpp-fwjp is a security advisory published by GitHub Security Advisories with High severity. commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the...

Which CVE IDs does GHSA-f9pm-gcpp-fwjp cover?

GHSA-f9pm-gcpp-fwjp covers the following CVE IDs: CVE-2026-86433. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-f9pm-gcpp-fwjp?

GHSA-f9pm-gcpp-fwjp has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-f9pm-gcpp-fwjpHighCVSS 7.5

commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the...

Vendor

GitHub Security Advisories

Published

September 7, 2026

Last Modified

September 7, 2026

🔗 CVE IDs covered (1)

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.

🔗 References (4)

https://github.com/thephpleague/commonmark/security/advisories/GHSA-g2gp-3wwq-f4ph
https://nvd.nist.gov/vuln/detail/CVE-2026-86433
https://www.vulncheck.com/advisories/commonmark-1.5.0-before-2.8.4-denial-of-service-via-attributes
https://github.com/advisories/GHSA-f9pm-gcpp-fwjp