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CVE-2026-86540

7.8 · HIGH

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 .know…

Published Sep 7, 2026CWE-78EPSS 0.21%

Overview

CVE-2026-86540 is a high-severity vulnerability. It was published on September 7, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157GitHubgithub.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216GitHubgithub.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396GitHubgithub.com/knowns-dev/knowns/releases/tag/v0.30.0GitHubgithub.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3Refwww.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary

How CyberStrike helps

Frequently asked questions

What is CVE-2026-86540?

CVE-2026-86540 is a high-severity vulnerability. It was published on September 7, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-86540?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-86540?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-86540?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-86540 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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