CVE-2026-86540
CVE-2026-86540 · knowns before 0.30.0 Arbitrary Code Execution via LSP Binary
This page contains facts from public vulnerability sources. Check the original advisory before updating.
knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/config.json file. When a repository with a crafted configuration is opened, the unvalidated binary path is executed twice under the user's account without any verification.
CVSS 8.5 · High · EPSS 0.2% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
Original sources
- https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3
- https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157
- https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216
- https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396
- https://github.com/knowns-dev/knowns/releases/tag/v0.30.0
- https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary
- https://nvd.nist.gov/vuln/detail/CVE-2026-86540