CVE-2026-105830

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,...

CVE-2026-105830 league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via TableStartParser

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,...

EUVD-2026-95017

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,...

CVE-2026-105830

The league/commonmark library (versions 2.0.0 before 2.10.2 ) is vulnerable to a quadratic-time denial of service (DoS) attack within the GitHub Flavored Markdown Table extension. The issue resides in the TableStartParser::tryStart() block-start scan, where unauthenticated attackers can submit a ...

PT-2026-107989

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,...

GHSA-3Q6V-R5MR-HXV8 league/commonmark: Quadratic-time denial of service in the GitHub Flavored Markdown Table extension block-start scan

Summary league/commonmark's GitHub Flavored Markdown Table extension registers TableStartParser as a block-start parser. While a paragraph is the active block, the core block parser calls TableStartParser::tryStart on every non-blank line. Its first action fetches the entire growing paragraph...

league/commonmark: Quadratic-time denial of service in the GitHub Flavored Markdown Table extension block-start scan

Summary league/commonmark's GitHub Flavored Markdown Table extension registers TableStartParser as a block-start parser. While a paragraph is the active block, the core block parser calls TableStartParser::tryStart on every non-blank line. Its first action fetches the entire growing paragraph...