GHSA-mc52-mwq4-vfx3: knowns (CVE-2026-86540)

Package	Ecosystem	Affected	Fixed in
knowns	npm	<0.30.0	0.30.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Knowns, an npm package, is affected in versions before 0.30.0. A malicious or tampered project-level .knowns/config.json can set an LSP binary path that the tool trusts without validation, so opening such a repository runs the attacker's executable during health checks and again when the LSP server starts. The source describes this as reachable without user interaction when chained with a separate config overwrite issue, and the source gives few details on that chain. Upgrade to version 0.30.0 or later, which is the fixed version listed.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.5	High	4.0	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	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0021, the 11th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 13:34 UTC First seen by agentprime
31 Oct 2026, 13:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.