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`append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency

Type: advisorySources: OSV

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][arrayref-advisory] for more detail. [arrayref-advisory]: https://rustsec.org/advisories/RUSTSEC-2026-0260.html

Products
append-only-vec
Affected versions
Not specified
Fixed versions
0.1.10-0
CVEs
Not specified
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 12:06 UTC · Revision 1

Source evidence

`append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency

core-osv · Original source

Published 20 Aug 2026, 12:00 UTC

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][arrayref-advisory] for more detail. [arrayref-advisory]: https://rustsec.org/advisories/RUSTSEC-2026-0260.html

osv:RUSTSEC-2026-0262

append-only-vec

Fixed versions: 0.1.10-0

Complete source record
{
  "id": "6834b0c47a5ed1ff0181a162332fefe026e43811b93ebaff2585099bac113003",
  "url": "https://osv.dev/vulnerability/RUSTSEC-2026-0262",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "`append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency",
    "summary": "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][arrayref-advisory] for more detail. [arrayref-advisory]: https://rustsec.org/advisories/RUSTSEC-2026-0260.html",
    "evidence": "osv:RUSTSEC-2026-0262",
    "products": [
      {
        "name": {
          "value": "append-only-vec",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.1.10-0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "RUSTSEC-2026-0262",
      "aliases": [
        "RUSTSEC-2026-0262"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.1.9"
                },
                {
                  "fixed": "0.1.10-0"
                }
              ]
            }
          ],
          "package": {
            "name": "append-only-vec",
            "purl": "pkg:cargo/append-only-vec",
            "ecosystem": "crates.io"
          },
          "database_specific": {
            "cvss": null,
            "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0262.json",
            "categories": [
              "malicious"
            ],
            "informational": null
          },
          "ecosystem_specific": {
            "affects": {
              "os": [],
              "arch": [],
              "functions": []
            },
            "affected_functions": null
          }
        }
      ],
      "modified": "2026-10-20T11:00:02.677736709Z",
      "provider": "osv",
      "references": [
        "https://crates.io/crates/append-only-vec",
        "https://rustsec.org/advisories/RUSTSEC-2026-0262.html",
        "https://blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref"
      ],
      "provider_metadata": {
        "license": "CC0-1.0"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 387117,
  "published_at": "2026-08-20T12:00:00+00:00"
}