RUSTSEC-2026-0015 `polymarkets-client-sdk` was removed from crates.io for malicious code
A malicious typosquatted Rust crate attempted to steal local credentials, requiring developers to audit dependencies for supply chain integrity.
- 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-2026-0015?
RUSTSEC-2026-0015 is a vulnerability in polymarkets-client-sdk, published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
It appeared to be typosquatting existing crate
polymarket-client-sdk (polymarkets vs
polymarket) and attempting to steal credentials from local files.
The malicious crate had 1 version published on 2026-02-19 an hour before removal and hadn't been downloaded. There were no crates depending on this crate on crates.io.
Thanks to Carol Nichols, who is thanking herself for spotting this in the docs.rs build queue and removing it quickly!
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-2026-0015?
1 open source package ship an affected version, including polymarkets-client-sdk.
| Package | Affected | Fixed in |
|---|---|---|
polymarkets-client-sdk crates.io | From 0.0.0-0 | None |
How do I fix RUSTSEC-2026-0015?
No fix has been published for RUSTSEC-2026-0015 yet. Limit exposure of the affected software until one is available.
Is RUSTSEC-2026-0015 being exploited?
There is no known exploitation of RUSTSEC-2026-0015 in the wild and no public exploit code.