Vulnerability record · CVE-2026-86540 · published 7 September 2026

CVE-2026-86540: OS command injection vulnerability

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.

8.5 CVSS 4.0 High EPSS 0.21% · top 89.6% CWE-78 · OS command injection Deferred

8.5CVSS 4.0 base score

0.21%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

6References

8 Sep 2026Last modified by NVD

Description

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
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://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3
https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary

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Source: NIST National Vulnerability Database (record CVE-2026-86540), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.