{"id":"CVE-2026-86540","summary":"knowns before 0.30.0 Arbitrary Code Execution via LSP Binary","details":"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.","aliases":["GHSA-mc52-mwq4-vfx3"],"modified":"2026-09-12T03:30:37.209134122Z","published":"2026-09-07T23:03:18.654Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-78"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86540.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86540.json"},{"type":"ADVISORY","url":"https://github.com/knowns-dev/knowns/releases/tag/v0.30.0"},{"type":"ADVISORY","url":"https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86540"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary"},{"type":"FIX","url":"https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396"},{"type":"ARTICLE","url":"https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157"},{"type":"ARTICLE","url":"https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/knowns-dev/knowns","events":[{"introduced":"0"},{"fixed":"cead30b2c3a34f66c0c40cb692ed51e588e63bd7"},{"fixed":"d3989829fb5095666d23d005b2f78a082832a396"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.30.0"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["v0.29.1","v0.29.0","v0.28.0","v0.27.1","v0.27.0","v0.23.0","v0.26.0","v0.25.0","v0.24.1","v0.24.0","v0.22.2","v0.22.1","v0.22.0","v0.21.0","v0.20.5","v0.20.4","v0.20.3","v0.20.2","v0.20.1","v0.20.0","v0.19.2","v0.19.1","v0.19.0","v0.18.4","v0.18.3","v0.18.2","v0.18.1","v0.18.0","v0.17.1","v0.17.0","v0.16.3","v0.16.2","v0.16.1","v0.16.0","v0.15.3","v0.15.2","v0.15.1","v0.15.0","v0.12.4","v0.12.3","v0.12.2","v0.12.1","v0.12.0","v0.11.4","v0.11.3","v0.11.2","v0.11.1","v0.11.0","v0.10.6","v0.10.5","v0.10.4","v0.10.3","v0.10.2","v0.10.1","v0.10.0","v0.9.0","v0.8.9","v0.8.8","v0.8.7","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.0","v0.6.0","v0.5.0","v0.4.0","v0.3.1","v0.3.0","v0.2.1","v0.2.0","v0.1.8","v0.1.7","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86540.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}