Description
knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.
References6
- github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/doc_…
- github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/memo…
- github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278…
- github.com/knowns-dev/knowns/releases/tag/v0.30.0
- github.com/knowns-dev/knowns/security/advisories/GHSA-9gfj-28hw…
- www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversa…
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
8.7
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 65 · as of 3 November 2026
- CWE
- CWE-22
Could this be exploited in your environment?
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