{"id":"CVE-2026-86540","title":"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","summary":"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 w…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-78"],"vendor":"knowns-dev","product":"knowns","affected":["knowns < 0.30.0"],"published":"2026-09-07","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:56:50.950","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86540","references":[{"url":"https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/releases/tag/v0.30.0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00212,"epssPercentile":0.10218,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-08T13:48:43.528505Z"},"ingestedAt":"2026-09-08T15:33:26.980Z","slug":"CVE-2026-86540","body":"## Overview\n\nknowns 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}