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RUSTSEC-2026-0016

polymarkets-rs-clob-client was removed from crates.io for malicious code

Reported
Issued
Package
polymarkets-rs-clob-client (crates.io)
Type
Vulnerability
Patched
no patched versions

Description

This is part of an ongoing campaign to attempt to typosquat crates in the polymarket-client-sdk ecosystem to exfiltrate user credentials.

The malicious crate had 1 version published on 2026-02-19 approximately 20 hours before removal and had no evidence of actual downloads. There were no crates depending on this crate on crates.io.

Thanks to Adam Harvey at the Rust Foundation, who is awkwardly thanking himself in this instance.

The crates.io team advises anyone developing with Polymarket to review dependencies carefully. We are investigating ways to mitigate this attacker who appears to be very motivated to steal Polymarket credentials.

Advisory available under CC0-1.0 license.