astral-tokio-tar Vulnerable to PAX Header Desynchronization

{
  "id": "91dadbd7e007f36243ad61d51cc36d5b928662e3169124e6e0051d76d2040fdf",
  "url": "https://osv.dev/vulnerability/RUSTSEC-2025-0110",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "astral-tokio-tar Vulnerable to PAX Header Desynchronization",
    "summary": "Versions of astral-tokio-tar prior to 0.5.6 contain a boundary parsing vulnerability that allows attackers to smuggle additional archive entries by exploiting inconsistent PAX/ustar header handling. When processing archives with PAX-extended headers containing size overrides, the parser incorrectly advances stream position based on ustar header size (often zero) instead of the PAX-specified size, causing it to interpret file content as legitimate tar headers. This vulnerability was disclosed to multiple Rust tar parsers, all derived from the original async-tar fork of tar-rs. For additional information see [Edera's blog post](https://edera.dev/stories/tarmageddon).",
    "evidence": "osv:RUSTSEC-2025-0110",
    "products": [
      {
        "name": {
          "value": "astral-tokio-tar",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.5.6",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RUSTSEC-2025-0110",
      "aliases": [
        "CVE-2025-62518",
        "GHSA-j5gw-2vrg-8fgx",
        "RUSTSEC-2025-0110",
        "RUSTSEC-2025-0111"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.0.0-0"
                },
                {
                  "fixed": "0.5.6"
                }
              ]
            }
          ],
          "package": {
            "name": "astral-tokio-tar",
            "purl": "pkg:cargo/astral-tokio-tar",
            "ecosystem": "crates.io"
          },
          "database_specific": {
            "cvss": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2025-0110.json",
            "categories": [
              "format-injection"
            ],
            "informational": null
          },
          "ecosystem_specific": {
            "affects": {
              "os": [],
              "arch": [],
              "functions": []
            },
            "affected_functions": null
          }
        }
      ],
      "modified": "2026-10-12T18:00:11.489562704Z",
      "provider": "osv",
      "references": [
        "https://crates.io/crates/astral-tokio-tar",
        "https://rustsec.org/advisories/RUSTSEC-2025-0110.html",
        "https://github.com/astral-sh/tokio-tar/commit/22b3f884adb7a2adf1d3a8d03469533f5cbc8318"
      ],
      "provider_metadata": {
        "license": "CC0-1.0"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-62518",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 306414,
  "published_at": "2025-10-21T12:00:00+00:00"
}