CVE catalog
CVE-2026-76098
Mistune 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 fr
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.49% · Oct 25, 2026
Mistune 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
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | mistune | sid | 3.4.0-1 | fixed |
| Debian | mistune | forky | 3.1.4-1 | vulnerable |
| Debian | mistune | trixie | 3.1.3-1 | vulnerable |
| Debian | mistune | bookworm | 2.0.4-1 | vulnerable |
| Pip | mistune | Not reported | 3.3.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mistune | source | sid | 3.3.4-1 | not yet assigned | Not reported | [1145881] |
| Debian | mistune | source | forky | (unfixed) | not yet assigned | Not reported | [1145881] |
| Debian | mistune | source | trixie | (unfixed) | not yet assigned | Not reported | [1145881] |
| Debian | mistune | source | bookworm | (unfixed) | not yet assigned | Not reported | [1145881] |
| Pip | mistune | pip | Not reported | 3.3.3 | Not reported | GHSA-6M44-FPC8-C3RQ | Not reported |
Notes
[trixie] mistune: Minor issue [bookworm] mistune: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-mistune]Affected
Source package: [mistune]
Details (2)
2.0.4-1· all · bookwormAffected
nvd · mistune · debian · bookworm; nvd · mistune · debian · 12
2.0.4-1· all · bookwormAffected
nvd · mistune · debian · bookworm; nvd · mistune · debian · 12
[Debian 13 (Trixie)]
- [python3-mistune]Affected
Source package: [mistune]
Details (2)
3.1.3-1· all · trixieAffected
nvd · mistune · debian · 13
3.1.3-1· all · trixieAffected
nvd · mistune · debian · 13
Observed:
References
- [https://github.com/advisories/GHSA-6m44-fpc8-c3rq]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-76098]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-76098]
- [https://security-tracker.debian.org/tracker/CVE-2026-76098]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76098.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]