CVE-2026-86540knowns before 0.30.0 Arbitrary Code Execution via LSP Binary
Updated under an hour ago ()
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It affects knowns-dev knowns. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-78
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
knowns-dev knowns knowns_dev:knowns (from the name) | before 0.30.0; 0.30.0 not affected | CNA record |
References
- https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3vendor-advisory
- https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157technical-description
- https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216technical-description
- https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396patch
- https://github.com/knowns-dev/knowns/releases/tag/v0.30.0release-notes
- https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binarythird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.