CVE-2026-105830

NameCVE-2026-105830
Descriptionleague/commonmark from 2.0.0 before 2.10.2 contains a quadratic-time denial of service vulnerability in the GitHub Flavored Markdown Table extension's TableStartParser::tryStart() block-start scan. Unauthenticated attackers can submit a large paragraph of pipe-free lines not starting with letters, forcing repeated full-buffer strpos scans that exhaust PHP worker CPU.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
php-league-commonmark (PTS)bookworm2.3.9-1+deb12u1vulnerable
trixie2.7.0-1+deb13u1vulnerable
forky, sid2.10.3-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
php-league-commonmarksource(unstable)2.10.3-1

Notes

https://github.com/thephpleague/commonmark/security/advisories/GHSA-3q6v-r5mr-hxv8

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