Skip to content
Heist/ feed
UnratedFix available

DEBIAN-CVE-2026-39860

Type: advisorySource: OSV1 source record

Nix is a package manager for Linux and other Unix systems. A bug in the fix for CVE-2024-27297 allowed for arbitrary overwrites of files writable by the Nix process orchestrating the builds (typically the Nix daemon running as root in multi-user installations) by following symlinks during fixed-output derivation output registration. This affects sandboxed Linux builds - sandboxed macOS builds are unaffected. The location of the temporary output used for the output copy was located inside the build chroot. A symlink, pointing to an arbitrary location in the filesystem, could be created by the derivation builder at that path. During output registration, the Nix process (running in the host mount namespace) would follow that symlink and overwrite the destination with the derivation's output contents. In multi-user installations, this allows all users able to submit builds to the Nix daemon (allowed-users - defaulting to all users) to gain root privileges by modifying sensitive files. This vulnerability is fixed in 2.34.5, 2.33.4, 2.32.7, 2.31.4, 2.30.4, 2.29.3, and 2.28.6.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-39860

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-39860

nix

Source reference: /affected/0/package/name

Affected versions
2.26.3+dfsg-1

Source reference: /affected/0/versions

2.32.5+dfsg-1

Source reference: /affected/0/versions

2.32.5+dfsg-2

Source reference: /affected/0/versions

2.34.3+dfsg-1

Source reference: /affected/0/versions

2.34.6+dfsg-1

Source reference: /affected/0/versions

2.34.8+dfsg-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

nix

Source reference: /affected/1/package/name

Affected versions
2.26.3+dfsg-1

Source reference: /affected/1/versions

2.32.5+dfsg-1

Source reference: /affected/1/versions

2.32.5+dfsg-2

Source reference: /affected/1/versions

2.34.3+dfsg-1

Source reference: /affected/1/versions

Fixed versions
2.34.6+dfsg-1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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-2026-39860.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.34.6+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"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39860.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56864 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement