HIGH 8.7 NVD
CVE-2026-115348
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 unauthenticate
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.
References
- https://github.com/lepture/mistune/security/advisories/GHSA-x2gr-6qf2-fc9x
- https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-time-dos-via-parse-lin
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-22 via NVD.
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