`unpack_in` can chmod arbitrary directories by following symlinks

{
  "id": "70313049d05ed228b090ecd1e3c218d481bfcb494723f6a31bae57625631855e",
  "url": "https://osv.dev/vulnerability/RUSTSEC-2026-0113",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "`unpack_in` can chmod arbitrary directories by following symlinks",
    "summary": "In versions 0.6.0 and earlier of astral-tokio-tar, the unpack_in API could inadvertently modify the permissions of external (i.e. non-archive) directories outside of the archive. An attacker could use this to contrite a tar archive that maliciously changes directory permissions outside of its intended hierarchy. This flaw only affects directories; individual file permissions cannot be modified via it. See GHSA-j4xf-2g29-59ph for the equivalent flaw in the tar crate.",
    "evidence": "osv:RUSTSEC-2026-0113",
    "products": [
      {
        "name": {
          "value": "astral-tokio-tar",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.6.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "RUSTSEC-2026-0113",
      "aliases": [
        "GHSA-xx64-wwv2-hcqq",
        "RUSTSEC-2026-0113"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.0.0-0"
                },
                {
                  "fixed": "0.6.1"
                }
              ]
            }
          ],
          "package": {
            "name": "astral-tokio-tar",
            "purl": "pkg:cargo/astral-tokio-tar",
            "ecosystem": "crates.io"
          },
          "database_specific": {
            "cvss": null,
            "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0113.json",
            "categories": [
              "file-disclosure"
            ],
            "informational": null
          },
          "ecosystem_specific": {
            "affects": {
              "os": [],
              "arch": [],
              "functions": []
            },
            "affected_functions": null
          }
        }
      ],
      "modified": "2026-10-12T18:00:09.237324844Z",
      "provider": "osv",
      "references": [
        "https://crates.io/crates/astral-tokio-tar",
        "https://rustsec.org/advisories/RUSTSEC-2026-0113.html",
        "https://github.com/astral-sh/tokio-tar/commit/f1fa37043a6fe798dcd1fd4b3000d889ac35b183"
      ],
      "provider_metadata": {
        "license": "CC0-1.0"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 306394,
  "published_at": "2026-04-27T12:00:00+00:00"
}