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tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all()

Type: advisorySources: OSV

tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-70622
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 16:52 UTC · Revision 1

Source evidence

tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all()

core-osv · Original source

Published 10 Aug 2026, 17:35 UTC

tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.

osv:CVE-2026-70622
Complete source record
{
  "id": "ddb890dbcf2e4d5d9c719285784141e3dae9c402788a29ab8e517dc570b6b9b8",
  "url": "https://osv.dev/vulnerability/CVE-2026-70622",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all()",
    "summary": "tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.",
    "evidence": "osv:CVE-2026-70622",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-70622",
      "aliases": [
        "CVE-2026-70622"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/composefs/tar-rs",
              "type": "GIT",
              "events": [
                {
                  "introduced": "322ee2ea81a10b063b808b244cab33cd0b45ad1f"
                },
                {
                  "last_affected": "fc459c149f83bf4daceaa52e17d351989002e1a9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.4.11"
                      },
                      {
                        "last_affected": "0.4.46"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.4.46",
            "0.4.45",
            "0.4.44",
            "0.4.43",
            "0.4.42",
            "0.4.41",
            "0.4.40",
            "0.4.39",
            "0.4.38",
            "0.4.37",
            "0.4.36",
            "0.4.35",
            "0.4.34",
            "0.4.33",
            "0.4.32",
            "0.4.31",
            "0.4.30",
            "0.4.29",
            "0.4.28",
            "0.4.27",
            "0.4.26",
            "0.4.25",
            "0.4.24",
            "0.4.23",
            "0.4.22",
            "0.4.21",
            "0.4.20",
            "0.4.19",
            "0.4.18",
            "0.4.17",
            "0.4.16",
            "0.4.15",
            "0.4.14",
            "0.4.13",
            "0.4.12",
            "0.4.11"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70622.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.595862384Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70622.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-70622",
        "https://www.vulncheck.com/advisories/tar-rs-symlink-escape-via-append-dir-all",
        "https://github.com/composefs/tar-rs",
        "https://gist.github.com/thesmartshadow/e7dac0bb690ee17b9cc142154cb11726"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-59"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70622.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-70622",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504949,
  "published_at": "2026-08-10T17:35:23.683+00:00"
}