RUSTSEC-2026-0262

Vulnerability from osv_rustsec – Published: 2026-08-20 12:00 – Updated: 2026-10-20 10:59 – Source website
VLAI
Summary
`append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency
Details

A new version of the append-only-vec crate was published with a direct dependency on proc-macro1, which would execute a malicious build script.

The compromised version of this crate was published on 2026-08-20, and was removed approximately 107 minutes later.

The compromised crate version was used as part of a malware campaign targeted at users of arrayref, which was downloaded 2,285 times before being removed; see the arrayref advisory for more detail.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "malicious"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "append-only-vec",
        "purl": "pkg:cargo/append-only-vec"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.9"
            },
            {
              "fixed": "0.1.10-0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "A new version of the `append-only-vec` crate was published with a direct dependency\non `proc-macro1`, which would execute a malicious build script.\n\nThe compromised version of this crate was published on 2026-08-20, and was\nremoved approximately 107 minutes later.\n\nThe compromised crate version was used as part of a malware campaign targeted\nat users of `arrayref`, which was downloaded 2,285 times before being removed;\nsee [the `arrayref` advisory][arrayref-advisory] for more detail.\n\n[arrayref-advisory]: https://rustsec.org/advisories/RUSTSEC-2026-0260.html",
  "id": "RUSTSEC-2026-0262",
  "modified": "2026-10-20T10:59:45Z",
  "published": "2026-08-20T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/append-only-vec"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0262.html"
    },
    {
      "type": "WEB",
      "url": "https://blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "`append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency"
}



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