CVE-2026-86540
knowns before 0.30.0 Arbitrary Code Execution via LSP Binary
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 |
| Vendor | knowns-dev |
| Product | knowns |
| Published | Sep 7, 2026 |
| Last Updated | Sep 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
knowns-dev / knowns
0 < 0.30.0
References
github.com: https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3 github.com: https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157 github.com: https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216 github.com: https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396 github.com: https://github.com/knowns-dev/knowns/releases/tag/v0.30.0 vulncheck.com: https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary
Credits
🔍 Tong Hoang Gia (uziii2208) 🔍 Nguyen Huy Hoang (hoanggxyuuki)