CVE-2026-86540

knowns before 0.30.0 Arbitrary Code Execution via LSP Binary

Published Sep 7, 2026 CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-mc52-mwq4-vfx3 knowns OS Command Injection via Insecure LSP Binary Path Config in .knowns/config.json
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Knowns-dev
Knowns-dev knowns
Vendors & Products Knowns-dev
Knowns-dev knowns
Type Values Removed Values Added
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.
Title knowns before 0.30.0 Arbitrary Code Execution via LSP Binary
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 24, 2026, 2:21 PM
Reserved
Sep 7, 2026, 10:18 PM
Status
Deferred
Published
Sep 7, 2026, 11:16 PM
Modified
Sep 8, 2026, 7:56 PM