Malicious Package Affecting proc-macro-en package, versions =1.0.10
Threat Intelligence
Snyk has reported that there have been attempts or successful attacks targeting this vulnerability.
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Test your applications- Snyk IDSNYK-RUST-PROCMACROEN-19005844
- published20 Aug 2026
- disclosed19 Aug 2026
- creditUnknown
Introduced: 19 Aug 2026
New Malicious CVE NOT AVAILABLE CWE-506 (opens in a new tab)How to fix?
Avoid using all malicious instances of the proc-macro-en package.
Overview
proc-macro-en is a malicious package.
This package was compromised in a supply chain attack that silently injects a malicious build-time dependency. While the package attempts to impersonate a legitimate organization, no connection exists between them, and the vulnerable versions have since been removed from the official package manager.
When compiled via cargo build, it automatically downloads and executes an unauthorized remote binary payload on the host machine, even if none of the crate's functions are called. Immediate lockfile audits, build machine isolation, and dependency rollbacks to a clean version are strongly advised.