CVE-2026-86541
Severity CVSS v4.0:
HIGH
Type:
CWE-22
Path Traversal
Publication date:
07/09/2026
Last modified:
07/09/2026
Description
knowns versions before 0.30.0 contain a path traversal vulnerability in the handleCodeReplace() function that allows attackers to overwrite arbitrary files outside the project root. Attackers can supply absolute paths or relative paths containing directory traversal sequences to write malicious content to sensitive files like shell startup scripts or SSH configuration files.
Impact
Base Score 4.0
7.20
Severity 4.0
HIGH
Base Score 3.x
8.30
Severity 3.x
HIGH
References to Advisories, Solutions, and Tools
- https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/mcp/handlers/code.go#L588-L646
- https://github.com/knowns-dev/knowns/commit/a2c98fc5c313463576c9348beeec6a74ddd7333b
- https://github.com/knowns-dev/knowns/releases/tag/v0.30.0
- https://github.com/knowns-dev/knowns/security/advisories/GHSA-f539-xgc6-xw7q
- https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-code-replace-mcp-action


