{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2026-44028", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "state": "PUBLISHED", "assignerShortName": "mitre", "dateReserved": "2026-05-05T00:29:44.087Z", "datePublished": "2026-05-05T00:30:16.205Z", "dateUpdated": "2026-05-05T00:37:42.535Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Nix", "vendor": "NixOS", "versions": [{"lessThan": "2.28.7", "status": "affected", "version": "2.24.4", "versionType": "semver"}, {"lessThan": "2.29.4", "status": "affected", "version": "2.29.0", "versionType": "semver"}, {"lessThan": "2.30.5", "status": "affected", "version": "2.30.0", "versionType": "semver"}, {"lessThan": "2.31.5", "status": "affected", "version": "2.31.0", "versionType": "semver"}, {"lessThan": "2.32.8", "status": "affected", "version": "2.32.0", "versionType": "semver"}, {"lessThan": "2.33.6", "status": "affected", "version": "2.33.0", "versionType": "semver"}, {"lessThan": "2.34.7", "status": "affected", "version": "2.34.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Lix", "vendor": "Lix Project", "versions": [{"lessThan": "2.93.4", "status": "affected", "version": "2.93.0", "versionType": "semver"}, {"lessThan": "2.94.2", "status": "affected", "version": "2.94.0", "versionType": "semver"}, {"lessThan": "2.95.2", "status": "affected", "version": "2.95.0", "versionType": "semver"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in Nix before 2.34.7 and Lix before 2.95.2. Unbounded recursion in the NAR (Nix Archive) parser could lead to a stack-to-heap overflow when the parser is run on a coroutine stack. The stack is allocated without a guard page, which means that a stack overflow could overwrite memory on the heap and could allow arbitrary code execution as the Nix daemon (run as root in multi-user installations) if ASLR hardening is bypassed. This can be exploited by all users able to connect to the daemon (e.g., in Nix, this is configurable via the allowed-users setting, defaulting to all users). The fixed versions are 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, and 2.28.7 for Nix (introduced in 2.24.4); and 2.95.2, 2.94.2, and 2.93.4 for Lix (introduced in 2.93.0)."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-674", "description": "CWE-674 Uncontrolled Recursion", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-05-05T00:37:42.535Z"}, "references": [{"url": "https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407"}, {"url": "https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368"}, {"url": "https://www.openwall.com/lists/oss-security/2026/05/04/33"}, {"url": "https://www.openwall.com/lists/oss-security/2026/05/04/32"}], "x_generator": {"engine": "CVE-Request-form 0.0.1"}}}, "dataVersion": "5.2"}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Nix before 2.34.7 and Lix before 2.95.2. Unbounded recursion in the NAR (Nix Archive) parser could lead to a stack-to-heap overflow when the parser is run on a coroutine stack. The stack is allocated without a guard page, which means that a stack overflow could overwrite memory on the heap and could allow arbitrary code execution as the Nix daemon (run as root in multi-user installations) if ASLR hardening is bypassed. This can be exploited by all users able to connect to the daemon (e.g., in Nix, this is configurable via the allowed-users setting, defaulting to all users). The fixed versions are 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, and 2.28.7 for Nix (introduced in 2.24.4); and 2.95.2, 2.94.2, and 2.93.4 for Lix (introduced in 2.93.0)."}], "id": "CVE-2026-44028", "lastModified": "2026-05-05T01:16:06.983", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.1, "impactScore": 5.8, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-05-05T01:16:06.983", "references": [{"source": "cve@mitre.org", "url": "https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407"}, {"source": "cve@mitre.org", "url": "https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368"}, {"source": "cve@mitre.org", "url": "https://www.openwall.com/lists/oss-security/2026/05/04/32"}, {"source": "cve@mitre.org", "url": "https://www.openwall.com/lists/oss-security/2026/05/04/33"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "cve@mitre.org", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.93.0,2.93.4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.94.0,2.94.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.95.0,2.95.2)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Lix", "source": "cna", "vendor": "Lix Project"}, "product": "lix", "vendor": "lix_project"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.24.4,2.28.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.29.0,2.29.4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.30.0,2.30.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.31.0,2.31.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.32.0,2.32.8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.33.0,2.33.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.34.0,2.34.7)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Nix", "source": "cna", "vendor": "NixOS"}, "product": "nix", "vendor": "nixos"}], "created": "2026-05-05T02:30:13.813490+00:00", "title": "Stack-to-Heap Overflow in Nix Archive Parser Allows Privilege Escalation and Arbitrary Code Execution", "updated": "2026-05-05T04:00:11.762989+00:00", "vendors": ["lix_project", "lix_project$PRODUCT$lix", "nixos", "nixos$PRODUCT$nix"]}