CVE-2026-115348
CVE-2026-115348 · Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Mistune 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.
CVSS 8.7 · High · EPSS 0.4% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
mistune
- Versions
- ≥ 3.0.0, < 3.3.0: Affected (semver)
- 3.3.0: Not affected (semver)
Update to 3.3.0
mistune Debian:12
- Versions
- 2.0.4-1
- 2.0.4-2
- 3.0.2-1
- 3.0.2-2
- 3.1.3-1
- 3.1.4-1
- 3.3.4-1
- 3.4.0-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mistune Debian:13
- Versions
- 3.1.3-1
- 3.1.4-1
- 3.3.4-1
- 3.4.0-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mistune Debian:14
- Versions
- 3.1.3-1
- 3.1.4-1
- 3.3.4-1
- 3.4.0-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published