CVE-2026-64846

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{"affected": [{"affectedData": [{"product": "nix", "vendor": "NixOS", "versions": [{"status": "affected", "version": "< 2.35.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Nix is a package manager for Linux and other Unix systems. Prior to 2.35.0, a malicious derivation executed with the recursive-nix experimental feature can exploit a time-of-check/time-of-use race involving final symlink handling in the LocalStore restore path. The race can cause writeFile to follow a substituted final symlink when opening a path with O_TRUNC instead of enforcing FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. The primitive does not provide arbitrary-content writes and requires winning the race. This issue is fixed in version 2.35.0."}, {"lang": "es", "value": "Nix es un gestor de paquetes para Linux y otros sistemas Unix. Antes de la 2.35.0, una derivaci\u00f3n maliciosa ejecutada con la caracter\u00edstica experimental recursive-nix puede exploit una condici\u00f3n de carrera de tiempo de verificaci\u00f3n/tiempo de uso que involucra el manejo de symlinks finales en la ruta de restauraci\u00f3n de LocalStore. La condici\u00f3n de carrera puede hacer que writeFile siga un symlink final sustituido al abrir una ruta con O_TRUNC en lugar de aplicar FinalSymlink::DontFollow, permitiendo que el proceso Nix o nix-daemon cree o trunque un archivo vac\u00edo fuera de la sandbox de construcci\u00f3n con los permisos del usuario del demonio. La primitiva no proporciona escrituras de contenido arbitrario y requiere ganar la condici\u00f3n de carrera. Este problema est\u00e1 solucionado en la versi\u00f3n 2.35.0."}], "id": "CVE-2026-64846", "lastModified": "2026-10-18T20:10:00.110", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 2.8, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.1, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64846", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-20T19:32:14.918442Z", "version": "2.0.3"}}]}, "published": "2026-08-20T17:19:16.813", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390"}, {"source": "security-advisories@github.com", "url": "https://github.com/NixOS/nix/pull/15401"}, {"source": "security-advisories@github.com", "url": "https://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-61"}, {"lang": "en", "value": "CWE-367"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "nix: Nix: Arbitrary file truncation via time-of-check/time-of-use race", "id": "2520584", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520584"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-367", "details": ["Nix is a package manager for Linux and other Unix systems. Prior to 2.35.0, a malicious derivation executed with the recursive-nix experimental feature can exploit a time-of-check/time-of-use race involving final symlink handling in the LocalStore restore path. The race can cause writeFile to follow a substituted final symlink when opening a path with O_TRUNC instead of enforcing FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. The primitive does not provide arbitrary-content writes and requires winning the race. This issue is fixed in version 2.35.0.", "A flaw was found in Nix. A malicious derivation, when executed with the `recursive-nix` experimental feature enabled, can exploit a time-of-check/time-of-use (TOCTOU) race condition in the final symlink handling of the LocalStore restore path. This allows the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. This vulnerability does not allow for arbitrary content writes and requires a successful race condition."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. For additional information, refer to the upstream advisory at https://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f. As a workaround, ensure the recursive-nix experimental feature is not enabled in production environments."}, "name": "CVE-2026-64846", "package_state": [{"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "agent-sandbox/agent-sandbox-router", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "build-of-trustee/trustee-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "openshift-sandboxed-containers/osc-podvm-builder-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "openshift-sandboxed-containers/osc-podvm-payload-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": 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"cpe:/a:redhat:trusted_profile_analyzer:2", "fix_state": "Fix deferred", "package_name": "rhtpa/rhtpa-trustification-service-rhel9", "product_name": "Red Hat Trusted Profile Analyzer"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:3", "fix_state": "Fix deferred", "package_name": "rhtpa/rhtpa-rhel10", "product_name": "Red Hat Trusted Profile Analyzer"}], "public_date": "2026-08-20T16:18:06Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64846\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64846\nhttps://github.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390\nhttps://github.com/NixOS/nix/pull/15401\nhttps://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f"], "statement": "A time-of-check/time-of-use (TOCTOU) race condition flaw was found in Nix's LocalStore restore path when handling final symlinks. When a malicious derivation is executed with the recursive-nix experimental feature enabled, this flaw allows the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with daemon user permissions. This vulnerability is rated as having a low security impact because it requires the recursive-nix experimental feature to be enabled (which is not enabled by default and is unlikely in production environments), requires winning a race condition, and does not allow arbitrary content writes\u2014only file truncation to empty files.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.35.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "nix", "source": "cna", "vendor": "NixOS"}, "product": "nix", "vendor": "nixos"}], "created": "2026-08-20T18:00:03.693225+00:00", "updated": "2026-08-20T20:30:05.846238+00:00", "vendors": ["nixos", "nixos$PRODUCT$nix"]}