RUSTSEC-2026-0328

Vulnerability from osv_rustsec – Published: 2026-09-19 12:00 – Updated: 2026-10-03 07:29 – Source website
VLAI
Summary
`decompress`: tar-family extractors write archive entries without a path-traversal check (tar-slip)
Details

The tar-family extractors in decompress (.tar, .tar.gz, .tar.xz, .tar.bz2, .tar.zst) build each output path from the raw archive entry path and write to it with no traversal check, so a malicious archive can write files outside the destination directory, a "tar-slip" / zip-slip path traversal (CWE-22 / CWE-23).

In src/decompressors/tar_common.rs (tar_extract):

let filepath = entry.path()?;                                    // raw entry path
let filepath = filepath.components().skip(opts.strip).collect::<PathBuf>();
                                     // strips leading components only — keeps `..`
let outpath = to.join(filepath);
// ...
let mut outfile = fs::File::create(&outpath)?;                   // writes anywhere

.components().skip(opts.strip) removes a fixed number of leading path components but leaves interior .. components intact so an entry named e.g. ../../../../home/<user>/.bashrc, or an absolute path, resolves outside to. This affects all platforms.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "code-execution"
        ],
        "cvss": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "decompress::decompress"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "decompress",
        "purl": "pkg:cargo/decompress"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The tar-family extractors in `decompress` (`.tar`, `.tar.gz`, `.tar.xz`,\n`.tar.bz2`, `.tar.zst`) build each output path from the **raw archive entry path**\nand write to it with no traversal check, so a malicious archive can write files\n**outside** the destination directory, a \"tar-slip\" / zip-slip path traversal\n(CWE-22 / CWE-23).\n\nIn `src/decompressors/tar_common.rs` (`tar_extract`):\n\n```rust\nlet filepath = entry.path()?;                                    // raw entry path\nlet filepath = filepath.components().skip(opts.strip).collect::\u003cPathBuf\u003e();\n                                     // strips leading components only \u2014 keeps `..`\nlet outpath = to.join(filepath);\n// ...\nlet mut outfile = fs::File::create(\u0026outpath)?;                   // writes anywhere\n```\n\n`.components().skip(opts.strip)` removes a fixed number of *leading* path\ncomponents but leaves interior `..` components intact so an entry named \ne.g. `../../../../home/\u003cuser\u003e/.bashrc`, or an absolute path, resolves **outside** \n`to`. This affects all platforms.",
  "id": "RUSTSEC-2026-0328",
  "modified": "2026-10-03T07:29:09Z",
  "published": "2026-09-19T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/decompress"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0328.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rusty-ferris-club/decompress/issues/21"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "`decompress`: tar-family extractors write archive entries without a path-traversal check (tar-slip)"
}



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