{"id":"GHSA-m6wq-39m7-9xpp","revision":null,"records":[{"revision":"bd64f37d2119427db983ff702be6e8c8","observedAt":"2026-10-30T23:45:26.581+00:00","statement":{"source":"cve-program","id":"CVE-2026-62847","aliases":[],"title":"Metalama: Local code execution via DLL planting in world-writable temporary directories (Linux/macOS)","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.","state":0,"publishedAt":"2026-10-30T20:23:50.882+00:00","modifiedAt":"2026-10-30T22:13:12.107+00:00","affected":[{"ecosystem":"Vendor product","name":"Metalama","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"metalama\",\n                    \"product\": \"Metalama\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2025.1.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2025.2.0-preview, <= 2025.2.5-rc\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2026.0.0-preview, < 2026.0.25\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2026.1.0-preview, < 2026.1.19\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","score":8.2,"severity":"HIGH"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62847","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-62847","identifiers":["CVE-2026-62847"]},"retained":false,"historicalAffected":[]},{"revision":"014a752191f8491db569d25c2d5e86fb","observedAt":"2026-11-09T14:11:50.08+00:00","statement":{"source":"euvd","id":"EUVD-2026-114452","aliases":["CVE-2026-62847","GHSA-m6wq-39m7-9xpp"],"title":"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 embe…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","score":8.2,"severity":null}],"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"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-114452","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 30, 2026, 8:23:50 PM","dateUpdated":"Oct 30, 2026, 10:13:12 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-114452","identifiers":["EUVD-2026-114452","CVE-2026-62847","GHSA-m6wq-39m7-9xpp"]},"retained":false,"historicalAffected":[]},{"revision":"684b13e984664207a3e7b237fdbead44","observedAt":"2026-11-04T18:06:19.384+00:00","statement":{"source":"nvd","id":"CVE-2026-62847","aliases":[],"title":"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 embe…","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.","state":0,"publishedAt":"2026-10-30T21:17:13.807+00:00","modifiedAt":"2026-11-02T19:35:33.347+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","score":8.2,"severity":"HIGH"}],"references":["https://github.com/metalama/Metalama/commit/09911349a916e82194b1cfaa6d0a38acad928fc9","https://github.com/metalama/Metalama/commit/92c4feecfce86d18fcb007ab6d3a1b4383326a2e","https://github.com/metalama/Metalama/pull/1650","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","https://github.com/metalama/Metalama/security/advisories/GHSA-m6wq-39m7-9xpp"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62847","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-377","CWE-427"],"productCriteria":[],"sourceDates":{"published":"2026-10-30T21:17:13.807","lastModified":"2026-11-02T19:35:33.347"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-62847","identifiers":["CVE-2026-62847"]},"retained":false,"historicalAffected":[]},{"revision":"8177d71a605144959a7e59809a14be2e","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-m6wq-39m7-9xpp","aliases":["CVE-2026-62847"],"title":"Metalama allows local code execution through DLL planting in shared temporary directories","description":"## Summary\n\nMetalama loaded and executed compile-time assemblies, auxiliary executable tools, and embedded helper assemblies from predictable temporary directories. On Linux and macOS the default cache location was the world-writable system temporary directory (`Path.GetTempPath()`, i.e. `/tmp`), and previously-generated artifacts were trusted based on the presence of a sentinel/`.completed` marker file rather than on any integrity verification.\n\nA local, unprivileged user on a shared machine or CI/build agent can pre-create the deterministic cache directory structure and plant a malicious DLL together with the matching sentinel file. When a higher-privileged user (or build/service account) subsequently runs a build, Metalama finds the sentinel, skips regeneration, and loads and executes the attacker-supplied assembly inside the compiler / IDE / MSBuild process.\n\nAffected load-and-execute paths:\n- the cache of compile-time assemblies that Metalama generates from your aspects;\n- auxiliary executable tools that Metalama extracts to a local directory and then launches;\n- embedded .NET helper assemblies that Metalama extracts to a local directory and loads into the build / IDE process.\n\n## Impact\n\nArbitrary code execution in the security context of the building user — i.e. a local privilege escalation across user accounts on shared POSIX systems (multi-user developer machines, CI/build agents). The attacker obtains code execution as the victim without holding the victim's privileges, and can read source/secrets, tamper with build output (supply-chain injection), or disrupt builds.\n\n## Affected configurations\n\n- **Linux and macOS, default configuration — affected.** The shipped default uses the world-writable system temp directory.\n- **Windows, default configuration — not affected.** The default per-user temporary directory is protected by OS ACLs, so cross-user planting is not possible.\n- The `METALAMA_TEMP` environment variable is a deployer-controlled override and is **out of scope**: pointing it at an insecure (e.g. world-writable or attacker-owned) location is a deployment misconfiguration, not a defect in the product.\n\n## Severity\n\nCVSS v3.1: `AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H` = **8.2 (High)** for the affected POSIX default configuration (Scope:Changed reflects the cross-user privilege escalation).\n\nCVSS v4.0 cross-check: `CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:L/SI:H/SA:H` = 6.0 (Medium), which more granularly attributes low impact to the cache itself and high impact to the subsequent build process. The honest range is therefore Medium-High depending on the scoring model and platform.\n\n## Fix\n\nCaches and extraction directories were relocated from the world-writable system temp directory to per-user application-data locations (`$XDG_CACHE_HOME` / `~/.cache/Metalama` on POSIX), relying on OS-enforced per-user ownership as the trust boundary. Fixed in **2026.1.19**.\n\n## Weaknesses\n\n- CWE-377: Insecure Temporary File\n- CWE-427: Uncontrolled Search Path Element\n\n## Affected packages\n\n- Metalama.Framework < 2026.1.19, \n- Metalama.Tool < 2026.1.19\n\nInternal tracking: metalama/Metalama#1650.","state":0,"publishedAt":"2026-10-14T19:24:53+00:00","modifiedAt":"2026-10-14T19:30:07.0668081+00:00","affected":[{"ecosystem":"NuGet","name":"Metalama.Framework","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"2026.1.0-preview"},{"kind":"fixed","version":"2026.1.19"}]}],"versions":["2026.1.0-preview","2026.1.1-preview","2026.1.10-preview","2026.1.11-preview","2026.1.12-preview","2026.1.13-preview","2026.1.14-rc","2026.1.15-rc","2026.1.16","2026.1.17","2026.1.18","2026.1.2-preview","2026.1.3-preview","2026.1.4-preview","2026.1.5-preview","2026.1.6-preview","2026.1.7-preview","2026.1.8-preview","2026.1.9-preview"],"rawVersionEvidence":null},{"ecosystem":"NuGet","name":"Metalama.Tool","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"2026.1.0-preview"},{"kind":"fixed","version":"2026.1.19"}]}],"versions":["2026.1.0-preview","2026.1.1-preview","2026.1.10-preview","2026.1.11-preview","2026.1.12-preview","2026.1.13-preview","2026.1.14-rc","2026.1.15-rc","2026.1.16","2026.1.17","2026.1.18","2026.1.2-preview","2026.1.3-preview","2026.1.4-preview","2026.1.5-preview","2026.1.6-preview","2026.1.7-preview","2026.1.8-preview","2026.1.9-preview"],"rawVersionEvidence":null},{"ecosystem":"NuGet","name":"Metalama.Framework","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2025.1.18"}]}],"versions":["0.5.0-preview","0.5.1-preview","0.5.10-preview","0.5.11-preview","0.5.12-preview","0.5.13-preview","0.5.15-preview","0.5.16-preview","0.5.17-preview","0.5.18-preview","0.5.19-preview","0.5.2-preview","0.5.20-preview","0.5.21-preview","0.5.22-preview","0.5.23-preview","0.5.24-preview","0.5.25-preview","0.5.26-preview","0.5.27-preview","0.5.28-preview","0.5.29-preview","0.5.3-preview","0.5.30-preview","0.5.31-preview","0.5.32-preview","0.5.33-preview","0.5.34-preview","0.5.35-preview","0.5.36-preview","0.5.37-preview","0.5.38-preview","0.5.39-preview","0.5.4-preview","0.5.40-preview","0.5.41-preview","0.5.42-preview","0.5.43-preview","0.5.44-preview","0.5.45-preview","0.5.46-preview","0.5.47-preview","0.5.48-preview","0.5.49-preview","0.5.5-preview","0.5.50-preview","0.5.51-preview","0.5.52-preview","0.5.53-preview","0.5.54-preview","0.5.55-preview","0.5.56-preview","0.5.57-preview","0.5.58-preview","0.5.59-preview","0.5.6-preview","0.5.60-preview","0.5.61-preview","0.5.62-preview","0.5.63-preview","0.5.64-preview","0.5.65-preview","0.5.66-preview","0.5.67-preview","0.5.68-preview","0.5.69-preview","0.5.7-preview","0.5.70-preview","0.5.71-preview","0.5.72-preview","0.5.73-preview","0.5.74-preview","0.5.75-preview","0.5.76-preview","0.5.77-preview","0.5.78-preview","0.5.79-preview","0.5.8-preview","0.5.80-preview","0.5.81-preview","0.5.82-preview","0.5.83-preview","0.5.9-preview","2023.0.101-rc","2023.0.102-rc","2023.0.103-rc","2023.0.104-rc","2023.0.105-rc","2023.0.106-rc","2023.0.107-rc","2023.0.108-rc","2023.0.109-rc","2023.0.110-rc","2023.0.111-rc","2023.0.112-rc","2023.0.113-rc","2023.0.114","2023.0.115","2023.0.116","2023.0.117","2023.0.118","2023.0.119","2023.0.120","2023.0.121","2023.1.1-preview","2023.1.10","2023.1.11","2023.1.12","2023.1.2-preview","2023.1.3-preview","2023.1.4-preview","2023.1.5-preview","2023.1.6-rc","2023.1.7-rc","2023.1.8-rc","2023.1.9","2023.2.1-preview","2023.2.2-rc","2023.2.3-rc","2023.2.4","2023.2.5","2023.3.1-preview","2023.3.10","2023.3.2-preview","2023.3.3-preview","2023.3.4-preview","2023.3.5-rc","2023.3.6-rc","2023.3.7-rc","2023.3.8","2023.3.9","2023.4.1-preview","2023.4.2-preview","2023.4.3-preview","2023.4.4-preview","2023.4.5-rc","2023.4.6","2023.4.7","2023.4.8","2023.4.9","2024.0.1-preview","2024.0.10","2024.0.11","2024.0.12","2024.0.13","2024.0.14","2024.0.15","2024.0.16","2024.0.2-preview","2024.0.3-preview","2024.0.4-rc","2024.0.5-rc","2024.0.6","2024.0.7","2024.0.8","2024.0.9","2024.1.1-preview","2024.1.10-rc","2024.1.11-rc","2024.1.12","2024.1.13","2024.1.14","2024.1.15","2024.1.16","2024.1.17","2024.1.18","2024.1.19","2024.1.2-preview","2024.1.20","2024.1.21","2024.1.22","2024.1.23","2024.1.24","2024.1.25","2024.1.26","2024.1.27","2024.1.28","2024.1.29","2024.1.3-preview","2024.1.30","2024.1.4-preview","2024.1.5-preview","2024.1.6-preview","2024.1.7-preview","2024.1.8-preview","2024.1.9-rc","2024.2.1-preview","2024.2.10-preview","2024.2.11-preview","2024.2.12-preview","2024.2.13-rc","2024.2.14-rc","2024.2.15-rc","2024.2.16-rc","2024.2.17-rc","2024.2.18","2024.2.19","2024.2.2-preview","2024.2.20","2024.2.21","2024.2.22","2024.2.23","2024.2.24","2024.2.25","2024.2.26","2024.2.27","2024.2.28","2024.2.29","2024.2.3-preview","2024.2.30","2024.2.31","2024.2.32","2024.2.4-preview","2024.2.5-preview","2024.2.6-preview","2024.2.7-preview","2024.2.8-preview","2024.2.9-preview","2025.0.1-preview","2025.0.10","2025.0.11","2025.0.12","2025.0.2-preview","2025.0.3-preview","2025.0.4-preview","2025.0.5-preview","2025.0.6-rc","2025.0.7-rc","2025.0.8","2025.0.9","2025.1.1-previe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