High severity7.5NVD Advisory· Published Oct 22, 2026· Updated Oct 22, 2026

CVE-2026-115349

Description

Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.

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Affected products

Authlib/Mistunellm-create
Range: <3.3.0

Patches

Vulnerability mechanics

References

github.com/lepture/mistune/security/advisories/GHSA-3q64-rw38-243vnvd
www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nested-bracket-parsingnvd

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000