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DEBIAN-CVE-2026-42171

Type: advisorySource: OSV1 source record

NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-42171

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-2026-42171

nsis

Source reference: /affected/0/package/name

Affected versions
3.08-3

Source reference: /affected/0/versions

3.08-3+deb12u1

Source reference: /affected/0/versions

3.09-1

Source reference: /affected/0/versions

3.09-2

Source reference: /affected/0/versions

3.09-3

Source reference: /affected/0/versions

3.09-4

Source reference: /affected/0/versions

3.10-1

Source reference: /affected/0/versions

3.10-2

Source reference: /affected/0/versions

3.11-1

Source reference: /affected/0/versions

3.12-1

Source reference: /affected/0/versions

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

nsis

Source reference: /affected/1/package/name

Affected versions
3.11-1

Source reference: /affected/1/versions

3.12-1

Source reference: /affected/1/versions

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

nsis

Source reference: /affected/2/package/name

Affected versions
3.11-1

Source reference: /affected/2/versions

Fixed versions
3.12-1

Source reference: /affected/2/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": "nsis",
      "purl": "pkg:deb/debian/nsis?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.08-3",
      "3.08-3+deb12u1",
      "3.09-1",
      "3.09-2",
      "3.09-3",
      "3.09-4",
      "3.10-1",
      "3.10-2",
      "3.11-1",
      "3.12-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42171.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nsis",
      "purl": "pkg:deb/debian/nsis?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.11-1",
      "3.12-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42171.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.12-1"
          }
        ]
      }
    ],
    "package": {
      "name": "nsis",
      "purl": "pkg:deb/debian/nsis?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.11-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42171.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56995 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-42171 · Revision 1Source updated