CVE-2026-77650

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

21/08/2026

Last modified:

21/08/2026

Description

The append-only-vec crate 0.1.9 for Rust can trigger execution of malicious code when compiling a project that uses the crate, because it has a rogue dependency that registers with a command-and-control server to offer arbitrary code execution.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

9.80

Severity 3.x

CRITICAL

References to Advisories, Solutions, and Tools

https://blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref
https://github.com/rustsec/advisory-db/issues/3161
https://rustsec.org/advisories/RUSTSEC-2026-0262.html
https://safedep.io/arrayref-proc-macro1-rust-build-time-malware/
https://www.stepsecurity.io/blog/arrayref-rust-crate-supply-chain-attack