Answer in brief
CVE-2026-86540 records a High severity (CVSS 8.5) vulnerability in knowns before 0.30.0 Arbitrary Code Execution via LSP Binary. The current sources do not mark it as known exploited. The current feed maps knowns-dev/knowns (generic), knowns (npm), knowns (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps knowns-dev/knowns (generic), knowns (npm), knowns (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| knowns-dev/knownsgeneric | >=0 <0.30.0 | 0.30.0 |
| knownsnpm | >=0 <0.30.0 | 0.30.0 |
| knownsnpm | <=0.29.1 | 0.30.0 |
Published upstream
Sep 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 7, 2026
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.
Quoted source text, attributed separately from HOL analysis.