{"id":"CVE-2026-62847","aliases":[],"cve":{"records":[{"id":"CVE-2026-62847","source":"GitHub_M","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-07-14T21:10:50.031Z","published":"2026-10-30T20:23:50.882Z","modified":"2026-10-30T22:13:12.107Z"}],"publishers":[{"name":"GitHub_M","role":"CNA","organizationId":"a0819718-46f1-4df5-94e2-005712e83aaa","modified":"2026-10-30T20:23:50.882Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-30T22:13:12.107Z"}],"references":[{"url":"https://github.com/metalama/Metalama/security/advisories/GHSA-m6wq-39m7-9xpp","tags":["x_refsource_CONFIRM"],"source":"GitHub_M"},{"url":"https://github.com/metalama/Metalama/pull/1650","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/metalama/Metalama/commit/09911349a916e82194b1cfaa6d0a38acad928fc9","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/metalama/Metalama/commit/92c4feecfce86d18fcb007ab6d3a1b4383326a2e","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/metalama/Metalama/releases/tag/release/2025.1.18","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/metalama/Metalama/releases/tag/release/2026.0.25","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/metalama/Metalama/releases/tag/release/2026.1.19","tags":["x_refsource_MISC"],"source":"GitHub_M"}],"weaknesses":[{"id":"CWE-377","description":"CWE-377: Insecure Temporary File","source":"GitHub_M"},{"id":"CWE-427","description":"CWE-427: Uncontrolled Search Path Element","source":"GitHub_M"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-30T21:21:14.933972Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"Metalama: Local code execution via DLL planting in world-writable temporary directories (Linux/macOS)","titleSource":"GitHub_M","descriptionSource":"GitHub_M","description":"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.","score":8.2,"severity":"high","published":"2026-10-30T20:23:50.882Z","modified":"2026-10-30T22:13:12.107Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"metalama","name":"Metalama","platforms":[],"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"}],"cpes":[],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-62847"}],"remediation":[],"references":["https://github.com/metalama/Metalama/security/advisories/GHSA-m6wq-39m7-9xpp","https://github.com/metalama/Metalama/pull/1650","https://github.com/metalama/Metalama/commit/09911349a916e82194b1cfaa6d0a38acad928fc9","https://github.com/metalama/Metalama/commit/92c4feecfce86d18fcb007ab6d3a1b4383326a2e","https://github.com/metalama/Metalama/releases/tag/release/2025.1.18","https://github.com/metalama/Metalama/releases/tag/release/2026.0.25","https://github.com/metalama/Metalama/releases/tag/release/2026.1.19"],"sources":[{"name":"CVE","id":"CVE-2026-62847","modified":"2026-10-30T22:13:12.107Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-62847"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","score":8.2}],"sourceAffected":[],"observedAt":"2026-10-30T22:48:26.578Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T18:55:34.234Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-30T22:00:33.230Z","attemptedAt":"2026-10-30T22:00:33.230Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-30T22:00:32.856Z","attemptedAt":"2026-10-30T22:00:32.856Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-30T22:00:32.856Z","attemptedAt":"2026-10-30T22:00:32.856Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-30T22:00:32.856Z","attemptedAt":"2026-10-30T22:00:32.856Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-m6wq-39m7-9xpp","url":"https://github.com/advisories/GHSA-m6wq-39m7-9xpp","modified":"2026-10-14T19:24:55Z","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","checkedAt":"2026-10-30T22:00:32.856Z"},{"source":"ENISA EUVD","id":"EUVD-2026-114452","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-114452","modified":"Oct 30, 2026, 8:23:50 PM","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","checkedAt":"2026-10-30T22:00:32.856Z"},{"source":"NVD","id":"CVE-2026-62847","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62847","modified":"2026-10-30T21:17:13.807","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","checkedAt":"2026-10-30T22:00:33.230Z"}],"aiSummary":{"text":"Metalama versions before 2025.1.18, 2026.0.25, and 2026.1.19 have a local code execution vulnerability via DLL planting in world-writable temporary directories on Linux and macOS. A local unprivileged user can plant a malicious DLL, which may be executed by a higher-privileged developer or build account. This permits privilege escalation and other security issues.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-31T00:21:05.520Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-62847"}]}}