MEDIUMUnknown →
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 f
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
Affected packages
- mistune
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://www.cve.org/CVERecord?id=CVE-2026-76098
- https://github.com/cveproject/cvelistv5/tree/main/cves/2026/76xxx/cve-2026-76098.json
- https://github.com/lepture/mistune/commit/0938fb7
- https://github.com/lepture/mistune/security/advisories/ghsa-6m44-fpc8-c3rq
- https://nvd.nist.gov/vuln/detail/cve-2026-76098
Structured record: https://ubuntu.com/security/CVE-2026-76098
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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