{"schemaVersion":3,"id":"CVE-2026-44028","aliases":["UBUNTU-CVE-2026-44028","DEBIAN-CVE-2026-44028","openSUSE-SU-2026:10696-1"],"status":"published","duplicateOf":null,"title":null,"description":"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).","dates":{"published":"2026-05-05T00:30:16.205Z","modified":"2026-05-09T03:40:06.637Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","exploitability":2.8,"impact":9.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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2.34.7-1.1","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"nix","label":"nix","category":"app"}},"hubHref":null}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407","label":"discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407","hostname":"discourse.nixos.org","tags":["REPORT"]},{"url":"https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368","label":"github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368","hostname":"github.com","tags":["REPORT"]},{"url":"https://www.openwall.com/lists/oss-security/2026/05/04/33","label":"www.openwall.com/lists/oss-security/2026/05/04/33","hostname":"www.openwall.com","tags":["REPORT"]},{"url":"https://www.openwall.com/lists/oss-security/2026/05/04/32","label":"www.openwall.com/lists/oss-security/2026/05/04/32","hostname":"www.openwall.com","tags":[]},{"url":"https://lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow/","label":"lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow/","hostname":"lix.systems","tags":[]},{"url":"https://ubuntu.com/security/CVE-2026-44028","label":"ubuntu.com/security/CVE-2026-44028","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-44028","label":"www.cve.org/CVERecord?id=CVE-2026-44028","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-44028","label":"security-tracker.debian.org/tracker/CVE-2026-44028","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-44028","label":"www.suse.com/security/cve/CVE-2026-44028","hostname":"www.suse.com","tags":["WEB"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:10208","RHSA-2026:10999","RHSA-2026:7046","RHSA-2026:9438"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-05-05T00:30:16.205Z","label":"Published","detail":"Vulnerability 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