CVE-2026-115347

NameCVE-2026-115347
DescriptionMistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced square brackets. Attackers can submit markdown containing long runs of unmatched brackets to mistune.html(), triggering repeated forward scans that stall worker processes for minutes.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
mistune (PTS)bookworm2.0.4-1vulnerable
trixie3.1.3-1vulnerable
forky3.1.4-1vulnerable
sid3.4.0-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
mistunesource(unstable)3.3.4-1

Notes

https://github.com/lepture/mistune/security/advisories/GHSA-f32h-38gf-rg5r

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