nix — security advisory

{
  "id": "156f9b1b19006b6695244fc9c51ff8f304b79bcc0996566a4ce0b72f6d0f09cb",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-44028",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-44028",
    "summary": "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).",
    "evidence": "osv:DEBIAN-CVE-2026-44028",
    "products": [
      {
        "name": {
          "value": "nix",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.26.3+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.32.5+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.32.5+dfsg-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.34.3+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.34.6+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.34.8+dfsg-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "nix",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.34.8+dfsg-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.26.3+dfsg-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.32.5+dfsg-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.32.5+dfsg-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.34.3+dfsg-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.34.6+dfsg-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-44028",
      "aliases": [
        "DEBIAN-CVE-2026-44028"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "nix",
            "purl": "pkg:deb/debian/nix?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "2.26.3+dfsg-1",
            "2.32.5+dfsg-1",
            "2.32.5+dfsg-2",
            "2.34.3+dfsg-1",
            "2.34.6+dfsg-1",
            "2.34.8+dfsg-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44028.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.34.8+dfsg-1"
                }
              ]
            }
          ],
          "package": {
            "name": "nix",
            "purl": "pkg:deb/debian/nix?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "2.26.3+dfsg-1",
            "2.32.5+dfsg-1",
            "2.32.5+dfsg-2",
            "2.34.3+dfsg-1",
            "2.34.6+dfsg-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44028.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-27T09:47:42.377141733Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-44028"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-44028"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-44028",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 461183,
  "published_at": "2026-05-05T01:16:06.983+00:00"
}