CVE-2026-86540

Published: Sep 7, 2026Modified: Sep 8, 2026Deferred

8.5

Vector

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:X/V:X/RE:X/U:X

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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:X/V:X/RE:X/U:XShow less

Source: disclosure@vulncheck.com (Secondary)

Description

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.

Related CWEs

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

References (6)

https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157

Source: disclosure@vulncheck.com

https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216

Source: disclosure@vulncheck.com

https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396

Source: disclosure@vulncheck.com

https://github.com/knowns-dev/knowns/releases/tag/v0.30.0

Source: disclosure@vulncheck.com

https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3

Source: disclosure@vulncheck.com

https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary

Source: disclosure@vulncheck.com

Timeline

No history available yet.