league/commonmark: Quadratic-time denial of service when parsing crafted Markdown

Date Aug 6, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product Composer · league/commonmark

CVE CVE-2026-71488

High-risk advisory CVE-2026-71488

Summary

league/commonmark: Quadratic-time denial of service when parsing crafted Markdown

Why it matters

GitHub has published a reviewed security advisory for league/commonmark. Prioritize it with other application dependency updates.

Operator check

Check whether league/commonmark is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-2q4p-g7hv-5rgv NVD — CVE-2026-71488 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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