CVE-2026-115348Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text

Descripción

Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser's parse_link_text function that allows unauthenticated attackers to exhaust CPU with unbalanced brackets. Attackers can submit Markdown containing many unbalanced '[' or '![' characters, forcing repeated unbounded forward scans and tying up worker processes for minutes.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• GitHub Security Advisory (GHSA-x2gr-6qf2-fc9x) vendor-advisory
• VulnCheck Advisory: Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text third-party-advisory