UnratedFix available

DEBIAN-CVE-2026-23950

Type: advisorySource: OSV1 source record

node-tar,a Tar for Node.js, has a race condition vulnerability in versions up to and including 7.5.3. This is due to an incomplete handling of Unicode path collisions in the `path-reservations` system. On case-insensitive or normalization-insensitive filesystems (such as macOS APFS, In which it has been tested), the library fails to lock colliding paths (e.g., `ß` and `ss`), allowing them to be processed in parallel. This bypasses the library's internal concurrency safeguards and permits Symlink Poisoning attacks via race conditions. The library uses a `PathReservations` system to ensure that metadata checks and file operations for the same path are serialized. This prevents race conditions where one entry might clobber another concurrently. This is a Race Condition which enables Arbitrary File Overwrite. This vulnerability affects users and systems using node-tar on macOS (APFS/HFS+). Because of using `NFD` Unicode normalization (in which `ß` and `ss` are different), conflicting paths do not have their order properly preserved under filesystems that ignore Unicode normalization (e.g., APFS (in which `ß` causes an inode collision with `ss`)). This enables an attacker to circumvent internal parallelization locks (`PathReservations`) using conflicting filenames within a malicious tar archive. The patch in version 7.5.4 updates `path-reservations.js` to use a normalization form that matches the target filesystem's behavior (e.g., `NFKD`), followed by first `toLocaleLowerCase('en

Announced 20 Jan 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-23950

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-2026-23950

node-tar

Source reference: /affected/0/package/name

Affected versions: 6.1.13+~cs7.0.5-1
Source reference: /affected/0/versions
6.1.13+~cs7.0.5-1+deb12u1
Source reference: /affected/0/versions
6.1.13+~cs7.0.5-2
Source reference: /affected/0/versions
6.1.13+~cs7.0.5-3
Source reference: /affected/0/versions
6.1.13+~cs7.0.5-4
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-1
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-10
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-11
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-2
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-3
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-4
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-5
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-6
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-7
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-8
Source reference: /affected/0/versions
6.2.1+ds1+~cs6.1.13-9
Source reference: /affected/0/versions
6.2.1+~cs7.0.8-1
Source reference: /affected/0/versions
7.5.16+~4.0.1-1
Source reference: /affected/0/versions
7.5.16+~4.0.1-2
Source reference: /affected/0/versions
7.5.19+~4.0.1-1
Source reference: /affected/0/versions
7.5.19+~4.0.1-2
Source reference: /affected/0/versions
7.5.22+~4.0.1-1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

node-tar

Source reference: /affected/1/package/name

Affected versions: 6.2.1+~cs7.0.8-1
Source reference: /affected/1/versions
Fixed versions: 6.2.1+~cs7.0.8-1+deb13u1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

node-tar

Source reference: /affected/2/package/name

Affected versions: 6.2.1+ds1+~cs6.1.13-1
Source reference: /affected/2/versions
6.2.1+ds1+~cs6.1.13-2
Source reference: /affected/2/versions
6.2.1+ds1+~cs6.1.13-3
Source reference: /affected/2/versions
6.2.1+ds1+~cs6.1.13-4
Source reference: /affected/2/versions
6.2.1+ds1+~cs6.1.13-5
Source reference: /affected/2/versions
6.2.1+ds1+~cs6.1.13-6
Source reference: /affected/2/versions
6.2.1+~cs7.0.8-1
Source reference: /affected/2/versions
Fixed versions: 6.2.1+ds1+~cs6.1.13-7
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": "node-tar",
      "purl": "pkg:deb/debian/node-tar?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "6.1.13+~cs7.0.5-1",
      "6.1.13+~cs7.0.5-1+deb12u1",
      "6.1.13+~cs7.0.5-2",
      "6.1.13+~cs7.0.5-3",
      "6.1.13+~cs7.0.5-4",
      "6.2.1+ds1+~cs6.1.13-1",
      "6.2.1+ds1+~cs6.1.13-10",
      "6.2.1+ds1+~cs6.1.13-11",
      "6.2.1+ds1+~cs6.1.13-2",
      "6.2.1+ds1+~cs6.1.13-3",
      "6.2.1+ds1+~cs6.1.13-4",
      "6.2.1+ds1+~cs6.1.13-5",
      "6.2.1+ds1+~cs6.1.13-6",
      "6.2.1+ds1+~cs6.1.13-7",
      "6.2.1+ds1+~cs6.1.13-8",
      "6.2.1+ds1+~cs6.1.13-9",
      "6.2.1+~cs7.0.8-1",
      "7.5.16+~4.0.1-1",
      "7.5.16+~4.0.1-2",
      "7.5.19+~4.0.1-1",
      "7.5.19+~4.0.1-2",
      "7.5.22+~4.0.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23950.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "6.2.1+~cs7.0.8-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "node-tar",
      "purl": "pkg:deb/debian/node-tar?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "6.2.1+~cs7.0.8-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23950.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "6.2.1+ds1+~cs6.1.13-7"
          }
        ]
      }
    ],
    "package": {
      "name": "node-tar",
      "purl": "pkg:deb/debian/node-tar?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "6.2.1+ds1+~cs6.1.13-1",
      "6.2.1+ds1+~cs6.1.13-2",
      "6.2.1+ds1+~cs6.1.13-3",
      "6.2.1+ds1+~cs6.1.13-4",
      "6.2.1+ds1+~cs6.1.13-5",
      "6.2.1+ds1+~cs6.1.13-6",
      "6.2.1+~cs7.0.8-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23950.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #56653 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 16:45:34 GMT
Publisher date: Tue, 20 Jan 2026 01:15:57 GMT

Read the original announcement