Rust advisories / append-only-vec
VulnerabilityRUSTSEC-2026-0262 · append-only-vec
RUSTSEC-2026-0262: `append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency
Short answerA security vulnerability in the append-only-vec crate: `append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency. No severity score was published. Fixed in 0.1.10: update to a fixed version.
| Crate | append-only-vec |
|---|---|
| Type | Vulnerability (malicious) |
| Affected versions | From 0.1.9 before 0.1.10. |
| Fixed in | 0.1.10 |
| Severity | not scored |
| Published | 2026-08-20 |
| Last changed | 2026-10-20 |
| Also known as | none |
What to do
- See which version you have:
cargo tree -i append-only-vec(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p append-only-vec. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for exampleappend-only-vec = "0.1.10") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
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
- Package: crates.io/crates/append-only-vec
- Advisory: rustsec.org/advisories/RUSTSEC-2026-0262.html
- Web: blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
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