Is CVE-2026-105830 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-105830?

CVE-2026-105830 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-105830

Description

league/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.