---
id: RUSTSEC-2026-0262
title: >-
  `append-only-vec` 0.1.9 was removed from crates.io due to a malicious
  dependency
summary: >-
  `append-only-vec` 0.1.9 was removed from crates.io due to a malicious
  dependency
severity: none
vendor: append-only-vec
product: append-only-vec
ecosystem: rust
affected:
  - append-only-vec >= 0.1.9-0
published: '2026-08-20'
updated: '2026-08-20'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0262'
references:
  - url: 'https://crates.io/crates/append-only-vec'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0262.html'
  - url: 'https://blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref'
tags:
  - osv
  - rust
ingestedAt: '2026-08-20T19:23:09.908Z'
---

## Overview

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.

This compromised version was published on 2026-08-20 and removed approximately
107 minutes later, with no evidence of actual usage.

## Affected packages

- `append-only-vec >= 0.1.9-0`

## Remediation

Refer to the advisory for the patched release.