It appeared to be typosquatting existing crate polymarket-client-sdk (clients vs client) and attempting to steal credentials from local files.
The malicious crate had 6 versions published on 2026-02-05 and had been downloaded only 59 times. There were no crates depending on this crate on crates.io.
Polymarket thanks Socket.dev for detecting and reporting this to the crates.io team!
{
"cwe_ids": [],
"github_reviewed": true,
"github_reviewed_at": "2026-02-06T20:56:19Z",
"nvd_published_at": null,
"severity": "CRITICAL"
}