Quick answers
- Is CVE-2026-115352 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-115352 being exploited in the wild.
- How severe is CVE-2026-115352?
- High severity, with a CVSS score of 7.5, published 22 October 2026.
- Which products and versions are affected?
- Lepture Mistune before 3.3.0.
- Is there a fix for CVE-2026-115352?
- Yes: fixed in 3.3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-115352 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-115352?
- Check whether you run Lepture Mistune at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 3.3.0
Technical details
The inline parser contains an O(N²) algorithmic complexity vulnerability in the link/image parsing dispatch loop. Every unmatched '[' character is treated as a potential link start and causes parse_link_text and parse_link_label to probe forward, resulting in quadratic work for N consecutive brackets. The vulnerability requires no authentication, affects default configurations, and has been confirmed PoC'd with parse times scaling as t = 0.0001 × N² milliseconds (16 KB ≈ 50 seconds).
Affected products
- lepture Mistune before 3.3.0
Timeline
- 2026-06-21: advisory: GitHub Security Advisory GHSA-xrpv-r66x-8p7j published
- 2026-10-22: disclosed: CVE-2026-115352 published on NVD