Knowns Unrestricted Path Traversal leading to out-of-bounds arbitrary .md file read, write, and deletion in MCP Docs ...
High-risk advisory
CVE-2026-86439
Summary
Knowns Unrestricted Path Traversal leading to out-of-bounds arbitrary .md file read, write, and deletion in MCP Docs + Memory Tools
Why it matters
GitHub has published a reviewed security advisory for knowns. Prioritize it with other application dependency updates, especially because EPSS places it in the 64% percentile.
Operator check
Check whether knowns is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 1.1%; percentile: 64%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.