RUSTSEC-2026-0016 `polymarkets-rs-clob-client` was removed from crates.io for malicious code
A malicious Rust crate was published to steal Polymarket credentials via typosquatting, requiring developers to audit dependencies.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is RUSTSEC-2026-0016?
RUSTSEC-2026-0016 is a vulnerability in polymarkets-rs-clob-client, published on 20 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by RUSTSEC-2026-0016?
1 open source package ship an affected version, including polymarkets-rs-clob-client.
| Package | Affected | Fixed in |
|---|---|---|
polymarkets-rs-clob-client crates.io | From 0.0.0-0 | None |
How do I fix RUSTSEC-2026-0016?
No fix has been published for RUSTSEC-2026-0016 yet. Limit exposure of the affected software until one is available.
Is RUSTSEC-2026-0016 being exploited?
There is no known exploitation of RUSTSEC-2026-0016 in the wild and no public exploit code.