No VulnCrest analysis published for this CVE yet. Below is the original CNA/NVD description, unmodified.
Description
Mistune before 3.3.3 contains a denial of service vulnerability in InlineParser.parse_link that allows attackers to cause quadratic CPU growth by supplying balanced nested brackets. Attackers can submit crafted Markdown with thousands of nested bracket pairs not forming a valid link, triggering repeated _contains_nested_link scans that exhaust CPU in parsing applications.
Exploits & detection
No public PoC or detection template found yet.
Timeline
- Published: 03 Nov 2026
- Last modified upstream: 07 Nov 2026
Sources & licenses
- CVE / CVSS / CWE
- NVD record ↗ (unmodified). This product uses the NVD API but is not endorsed or certified by the NVD. CVE® © The MITRE Corporation.
- Exploitation
- CISA KEV (CC0) · EPSS by FIRST.org
- References used for the analysis
- https://github.com/lepture/mistune/commit/fe02f40faf091f86da9ed62c865f31e11da111d7
- https://github.com/lepture/mistune/security/advisories/GHSA-47p6-w2rc-5qf7
- https://www.vulncheck.com/advisories/mistune-before-3.3.3-denial-of-service-via-balanced-bracket-link-parsing
- https://github.com/lepture/mistune/security/advisories/GHSA-47p6-w2rc-5qf7
- Analysis, summary and remediation
- © VulnCrest