Vulnerability-Lookup

GHSA-JGGJ-J5FQ-X969

Vulnerability from github – Published: 2026-05-05 03:31 – Updated: 2026-05-09 06:31

Details

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).

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-44028"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-674"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-05T01:16:06Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-jggj-j5fq-x969",
  "modified": "2026-05-09T06:31:35Z",
  "published": "2026-05-05T03:31:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44028"
    },
    {
      "type": "WEB",
      "url": "https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407"
    },
    {
      "type": "WEB",
      "url": "https://lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2026/05/04/32"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2026/05/04/33"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-44028 (GCVE-0-2026-44028)

Vulnerability from cvelistv5 – Published: 2026-05-05 00:30 – Updated: 2026-05-09 03:40

Summary

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

CWE

CWE-674 - Uncontrolled Recursion

Assigner

mitre

References

5 references

URL	Tags
https://discourse.nixos.org/t/security-advisory-l…
https://github.com/NixOS/nix/security/advisories/…
https://www.openwall.com/lists/oss-security/2026/…
https://www.openwall.com/lists/oss-security/2026/…
https://lix.systems/blog/2026-05-05-lix-unsigned-…

Impacted products

2 products

Vendor	Product	Version
NixOS	Nix	Affected: 2.24.4 , < 2.28.7 (semver) Affected: 2.29.0 , < 2.29.4 (semver) Affected: 2.30.0 , < 2.30.5 (semver) Affected: 2.31.0 , < 2.31.5 (semver) Affected: 2.32.0 , < 2.32.8 (semver) Affected: 2.33.0 , < 2.33.6 (semver) Affected: 2.34.0 , < 2.34.7 (semver)
Lix Project	Lix	Affected: 2.93.0 , < 2.93.4 (semver) Affected: 2.94.0 , < 2.94.2 (semver) Affected: 2.95.0 , < 2.95.2 (semver)

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-44028",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-05T14:03:11.111278Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-05T14:13:37.898Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "product": "Nix",
          "vendor": "NixOS",
          "versions": [
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              "lessThan": "2.28.7",
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              "version": "2.24.4",
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            },
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              "status": "affected",
              "version": "2.29.0",
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            },
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            },
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              "status": "affected",
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            },
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              "lessThan": "2.32.8",
              "status": "affected",
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              "versionType": "semver"
            },
            {
              "lessThan": "2.33.6",
              "status": "affected",
              "version": "2.33.0",
              "versionType": "semver"
            },
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              "lessThan": "2.34.7",
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        },
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            "scope": "CHANGED",
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        },
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          "url": "https://www.openwall.com/lists/oss-security/2026/05/04/32"
        },
        {
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    "datePublished": "2026-05-05T00:30:16.205Z",
    "dateReserved": "2026-05-05T00:29:44.087Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-JGGJ-J5FQ-X969

CVE-2026-44028 (GCVE-0-2026-44028)

Tags

Sightings

Nomenclature