CVE-2026-18991 nanocoai NanoClaw send_file core.ts path traversal
Remote attackers can exploit a path traversal vulnerability in the send_file component to read arbitrary files from the system.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18991?
CVE-2026-18991 is a medium-severity path traversal vulnerability in nanocoai NanoClaw, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security vulnerability has been detected in nanocoai NanoClaw up to 2.0.64. This affects an unknown part of the file container/agent-runner/src/mcp-tools/core.ts of the component send_file. Such manipulation leads to path traversal. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-22
Which versions are affected by CVE-2026-18991?
How do I fix CVE-2026-18991?
No fix has been published for CVE-2026-18991 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-2026-18991 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18991 exists.
Sources
Also known as GHSA-q94p-g4rh-r9rf.