Mistune: Potential DoS via quadratic-time parsing in parse_link_text
High-risk advisory
CVE-2026-49851
Summary
Mistune: Potential DoS via quadratic-time parsing in parse_link_text
Why it matters
GitHub has published a reviewed security advisory for mistune. Prioritize it with other application dependency updates, especially because EPSS places it in the 27% percentile.
Operator check
Check whether mistune is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 8.7. EPSS probability: 0.4%; percentile: 27%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.