RUSTSEC-2026-0265 `proc-macro1` was removed from crates.io due to malicious code

It was reported proc-macro1 contained a build script that would download a malicious payload. This crate had two versions, both published on 2026-08-20. The crate was removed from crates.io and related user accounts were locked. This crate was used as part of a malware campaign targeted at users ...