RUSTSEC-2026-0264 `proc-macro-en` was removed from crates.io due to malicious code

We identified that proc-macro-en contained the same build script as proc-macro1 and it was part of the same supply chain attack. This crate had one single version published at 2026-08-20. The crate was removed from crates.io and related user account was locked...

Malicious code in proc_macro_en (crates.io)

proc-macro-en is a malicious crate published to crates.io as part of the coordinated build-time payload campaign on 2026-08-20 that trojanized arrayref, internment, and append-only-vec and published the proc-macro1 typosquat of proc-macro2. It was used as an attacker-controlled dependency carryin...