CVE-2026-86541: fallo de gravedad alta en knowns-dev knowns
knowns before 0.30.0 Path Traversal via code.replace MCP action
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 7.2epss 0.8%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
Productos afectados
knowns-dev · knownsCVEs relacionadas — knowns-dev knowns
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-86439HIGHknowns before 0.30.0 Path Traversal via MCP doc and memory toolsEPSS 1.1%CVE-2026-86538HIGHknowns before 0.30.0 Path Traversal via templateFile parameterEPSS 1.0%CVE-2026-86543CRITICALknowns before 0.30.0 Unauthenticated Management API ExposureEPSS 0.9%CVE-2026-88899CRITICALknowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory HeaderEPSS 0.8%CVE-2026-86775HIGHknowns before 0.30.0 Path Traversal via Document APIEPSS 0.7%CVE-2026-86542HIGHknowns before 0.30.0 Path Traversal via Import NameEPSS 0.7%
Referencias
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/mcp/handlers/code.go#L588-L646https://github.com/knowns-dev/knowns/commit/a2c98fc5c313463576c9348beeec6a74ddd7333bhttps://github.com/knowns-dev/knowns/releases/tag/v0.30.0https://github.com/knowns-dev/knowns/security/advisories/GHSA-f539-xgc6-xw7qhttps://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-code-replace-mcp-action