CVE-2026-76098

NameCVE-2026-76098
DescriptionMistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.render_token() can exceed Python's recursion limit and raise RecursionError, allowing crafted Markdown to crash a parsing process. This issue is fixed in version 3.3.3
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)bullseye0.8.4-4vulnerable
bookworm2.0.4-1vulnerable
trixie3.1.3-1vulnerable
forky, sid3.1.4-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
mistunesource(unstable)(unfixed)

Notes

https://github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rq
https://github.com/lepture/mistune/commit/0938fb781d0aded99de801b340ec1f8debeae5b2 (v3.3.3)

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