internment 0.8.7 was published to crates.io from the same maintainer account (droundy) as the trojanized arrayref and append-only-vec releases, which appears to be compromised. The release adds a dependency on an attacker-controlled crate whose build script downloads and executes an architecture-specific remote binary at build time from https://23.254.165.112:9089/, passing 23.254.165.112:443 as a command-and-control address. Part of a coordinated crates.io campaign on 2026-08-20. The malicious release has been removed from crates.io; earlier internment releases are unaffected.

Credit: OpenSSF (source)

References

• rustsec/advisory-db#3161
• https://github.com/ossf/malicious-packages/blob/65e79a7e3677a36fcdbd109ea6e294bffc77f7db/osv/malicious/crates.io/internment/MAL-2026-14337.json
• https://safedep.io/arrayref-proc-macro1-rust-build-time-malware