usn-8138-2
Vulnerability from osv_ubuntu
Published
2026-04-14 20:01
Modified
2026-04-27 14:11
Summary
rust-tar vulnerability
Details

USN-8138-1 fixed a vulnerability in tar-rs. This update provides the corresponding update for Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that tar-rs incorrectly handled symlinks when unpacking a tar archive. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to modify permissions of arbitrary directories outside the extraction root, and possibly escalate privileges.


{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "librust-tar+default-dev",
            "binary_version": "0.4.26-1ubuntu0.1"
          },
          {
            "binary_name": "librust-tar-dev",
            "binary_version": "0.4.26-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "rust-tar",
        "purl": "pkg:deb/ubuntu/rust-tar@0.4.26-1ubuntu0.1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.26-1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.26-1"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8138-1 fixed a vulnerability in tar-rs. This update provides the\ncorresponding update for Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n It was discovered that tar-rs incorrectly handled symlinks when unpacking\n a tar archive. If a user or automated system were tricked into processing\n a specially crafted tar archive, a remote attacker could use this issue to\n modify permissions of arbitrary directories outside the extraction root,\n and possibly escalate privileges.",
  "id": "USN-8138-2",
  "modified": "2026-04-27T14:11:51Z",
  "published": "2026-04-14T20:01:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8138-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33056"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "rust-tar vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-33056"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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