{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-62847", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-14T21:10:50.031Z", "datePublished": "2026-10-30T20:23:50.882Z", "dateUpdated": "2026-10-30T22:13:12.107Z"}, "containers": {"cna": {"title": "Metalama: Local code execution via DLL planting in world-writable temporary directories (Linux/macOS)", "problemTypes": [{"descriptions": [{"cweId": "CWE-377", "lang": "en", "description": "CWE-377: Insecure Temporary File", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-427", "lang": "en", "description": "CWE-427: Uncontrolled Search Path Element", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/metalama/Metalama/security/advisories/GHSA-m6wq-39m7-9xpp", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/metalama/Metalama/security/advisories/GHSA-m6wq-39m7-9xpp"}, {"name": "https://github.com/metalama/Metalama/pull/1650", "tags": ["x_refsource_MISC"], "url": "https://github.com/metalama/Metalama/pull/1650"}, {"name": "https://github.com/metalama/Metalama/commit/09911349a916e82194b1cfaa6d0a38acad928fc9", "tags": ["x_refsource_MISC"], "url": "https://github.com/metalama/Metalama/commit/09911349a916e82194b1cfaa6d0a38acad928fc9"}, {"name": "https://github.com/metalama/Metalama/commit/92c4feecfce86d18fcb007ab6d3a1b4383326a2e", "tags": ["x_refsource_MISC"], "url": "https://github.com/metalama/Metalama/commit/92c4feecfce86d18fcb007ab6d3a1b4383326a2e"}, {"name": "https://github.com/metalama/Metalama/releases/tag/release/2025.1.18", "tags": ["x_refsource_MISC"], "url": "https://github.com/metalama/Metalama/releases/tag/release/2025.1.18"}, {"name": "https://github.com/metalama/Metalama/releases/tag/release/2026.0.25", "tags": ["x_refsource_MISC"], "url": "https://github.com/metalama/Metalama/releases/tag/release/2026.0.25"}, {"name": "https://github.com/metalama/Metalama/releases/tag/release/2026.1.19", "tags": ["x_refsource_MISC"], "url": "https://github.com/metalama/Metalama/releases/tag/release/2026.1.19"}], "affected": [{"vendor": "metalama", "product": "Metalama", "versions": [{"version": "< 2025.1.18", "status": "affected"}, {"version": ">= 2025.2.0-preview, <= 2025.2.5-rc", "status": "affected"}, {"version": ">= 2026.0.0-preview, < 2026.0.25", "status": "affected"}, {"version": ">= 2026.1.0-preview, < 2026.1.19", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-30T20:23:50.882Z"}, "descriptions": [{"lang": "en", "value": "Metalama is a Roslyn-based open-source patterns and architecture toolkit for C#. Prior to 2025.1.18, 2026.0.25 and 2026.1.19, Metalama.Framework and Metalama.Tool load and execute compile-time assemblies, auxiliary executable tools and embedded helper assemblies from predictable temporary directories. On `Linux` and `macOS`, the default `Path.GetTempPath()` location is world-writable, and existing artifacts are trusted based on sentinel or `.completed` marker files rather than integrity verification. A local unprivileged user on a shared machine or CI/build agent can pre-create the deterministic directory structure and plant a malicious DLL with the matching sentinel. When a higher-privileged developer or build account subsequently builds, Metalama skips regeneration and executes the planted artifact in the compiler, IDE or MSBuild process as the building user. This permits cross-user privilege escalation, reading source and secrets, supply-chain tampering with build output, or disrupting builds. Default Windows per-user temporary directories are protected by ACLs and are not affected. Deployer-selected insecure cache locations are outside the vulnerability's scope. This issue is fixed in versions 2025.1.18, 2026.0.25 and 2026.1.19."}], "source": {"advisory": "GHSA-m6wq-39m7-9xpp", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-30T21:21:14.933972Z", "id": "CVE-2026-62847", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-30T22:13:12.107Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "Metalama", "vendor": "metalama", "versions": [{"status": "affected", "version": "< 2025.1.18"}, {"status": "affected", "version": ">= 2025.2.0-preview, <= 2025.2.5-rc"}, {"status": "affected", "version": ">= 2026.0.0-preview, < 2026.0.25"}, {"status": "affected", "version": ">= 2026.1.0-preview, < 2026.1.19"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Metalama is a Roslyn-based open-source patterns and architecture toolkit for C#. Prior to 2025.1.18, 2026.0.25 and 2026.1.19, Metalama.Framework and Metalama.Tool load and execute compile-time assemblies, auxiliary executable tools and embedded helper assemblies from predictable temporary directories. On `Linux` and `macOS`, the default `Path.GetTempPath()` location is world-writable, and existing artifacts are trusted based on sentinel or `.completed` marker files rather than integrity verification. A local unprivileged user on a shared machine or CI/build agent can pre-create the deterministic directory structure and plant a malicious DLL with the matching sentinel. When a higher-privileged developer or build account subsequently builds, Metalama skips regeneration and executes the planted artifact in the compiler, IDE or MSBuild process as the building user. This permits cross-user privilege escalation, reading source and secrets, supply-chain tampering with build output, or disrupting builds. Default Windows per-user temporary directories are protected by ACLs and are not affected. Deployer-selected insecure cache locations are outside the vulnerability's scope. This issue is fixed in versions 2025.1.18, 2026.0.25 and 2026.1.19."}], "id": "CVE-2026-62847", "lastModified": "2026-10-30T21:17:13.807", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.5, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-30T21:17:13.807", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/metalama/Metalama/commit/09911349a916e82194b1cfaa6d0a38acad928fc9"}, {"source": "security-advisories@github.com", "url": "https://github.com/metalama/Metalama/commit/92c4feecfce86d18fcb007ab6d3a1b4383326a2e"}, {"source": "security-advisories@github.com", "url": "https://github.com/metalama/Metalama/pull/1650"}, {"source": "security-advisories@github.com", "url": "https://github.com/metalama/Metalama/releases/tag/release/2025.1.18"}, {"source": "security-advisories@github.com", "url": "https://github.com/metalama/Metalama/releases/tag/release/2026.0.25"}, {"source": "security-advisories@github.com", "url": "https://github.com/metalama/Metalama/releases/tag/release/2026.1.19"}, {"source": "security-advisories@github.com", "url": "https://github.com/metalama/Metalama/security/advisories/GHSA-m6wq-39m7-9xpp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-377"}, {"lang": "en", "value": "CWE-427"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-10-30T22:15:14.838205+00:00", "updated": "2026-10-30T22:15:14.838219+00:00", "vendors": []}