CVE-2026-115348

NameCVE-2026-115348
DescriptionMistune 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.
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-x2gr-6qf2-fc9x

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