CVE-2026-115354 Mistune before 3.3.0 Arbitrary Local File Read via Include Directive
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-115354?
CVE-2026-115354 is a high-severity vulnerability in lepture mistune, published on 22 Oct 2026.
Official description
Mistune before 3.3.0 contains a path traversal vulnerability in the opt-in Include directive that allows attackers to read local files by supplying relative or absolute include paths. Attackers who submit Markdown rendered via Markdown.read() can disclose files such as /etc/passwd and inject unescaped HTML or script content into rendered output.
Weakness: CWE-22
Which versions are affected by CVE-2026-115354?
How do I fix CVE-2026-115354?
No fix has been published for CVE-2026-115354 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-115354 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-115354 exists.
Sources
Also known as DEBIAN-CVE-2026-115354, GHSA-jhcm-5rpf-j3wv, GHSA-r6px-88r6-4rqg, UBUNTU-CVE-2026-115354.