{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86540", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-07T22:18:47.705Z", "datePublished": "2026-09-07T23:03:18.654Z", "dateUpdated": "2026-09-07T23:03:18.654Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-07T23:03:18.654Z"}, "datePublic": "2026-08-16T00:00:00.000Z", "title": "knowns before 0.30.0 Arbitrary Code Execution via LSP Binary", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "cweId": "CWE-78", "type": "CWE"}]}], "affected": [{"vendor": "knowns-dev", "product": "knowns", "defaultStatus": "unaffected", "packageURL": "pkg:npm/knowns", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "0.30.0"}, {"version": "0.30.0", "status": "unaffected", "versionType": "semver"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.5, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-mc52-mwq4-vfx3)"}, {"url": "https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157", "tags": ["technical-description"], "name": "Detector.resolve executes the unvalidated binary override (v0.29.1)"}, {"url": "https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216", "tags": ["technical-description"], "name": "ProjectSettings.Validate does not inspect the LSP binary field (v0.29.1)"}, {"url": "https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396", "tags": ["patch"], "name": "knowns fix commit d3989829fb50"}, {"url": "https://github.com/knowns-dev/knowns/releases/tag/v0.30.0", "tags": ["release-notes"], "name": "knowns v0.30.0 Release Notes"}, {"name": "VulnCheck Advisory: knowns before 0.30.0 Arbitrary Code Execution via LSP Binary", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary"}], "credits": [{"lang": "en", "value": "Tong Hoang Gia", "type": "reporter"}, {"lang": "en", "value": "Nguyen Huy Hoang", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:npm/knowns", "product": "knowns", "vendor": "knowns-dev", "versions": [{"lessThan": "0.30.0", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "0.30.0", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-86540", "lastModified": "2026-09-07T23:16:53.723", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.5, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-09-07T23:16:53.723", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/knowns-dev/knowns/releases/tag/v0.30.0"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

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