CVE-2026-19338 automateyournetwork MCPyATS generate_mermaid_markdown index.ts processGenerateRequest path traversal
A local attacker can exploit a path traversal vulnerability in the generate_mermaid_markdown function to read or modify arbitrary files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19338?
CVE-2026-19338 is a medium-severity path traversal vulnerability in automateyournetwork MCPyATS, published on 9 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was identified in automateyournetwork MCPyATS up to 0.1.4. The affected element is the function processGenerateRequest of the file mcp_servers/mermaid/index.ts of the component generate_mermaid_markdown. The manipulation of the argument folder/name leads to path traversal. The attack must be carried out locally.
Weakness: CWE-22
Which versions are affected by CVE-2026-19338?
How do I fix CVE-2026-19338?
No fix has been published for CVE-2026-19338 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-19338 being exploited?
There is no known exploitation of CVE-2026-19338 in the wild and no public exploit code.
Sources
Also known as GHSA-q9qj-38cq-3792.