High 7.8Published Sep 7, 2026

CVE-2026-86540knowns before 0.30.0 Arbitrary Code Execution via LSP Binary

Updated under an hour ago (Oct 27, 2026, 6:20 PM ET)

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Every CVE for knowns-dev knowns

Exploited in the last 30 days

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

Affected products

knowns-dev knowns knowns_dev:knowns (from the name)	before 0.30.0; 0.30.0 not affected	CNA record

References

References

https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3	vendor-advisory
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157	technical-description
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216	technical-description
https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396	patch
https://github.com/knowns-dev/knowns/releases/tag/v0.30.0	release-notes
https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary	third-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.