RUSTSEC-2026-0018 `rpc-check` was removed from crates.io for malicious code
A malicious typosquatted Rust crate exfiltrates user credentials, requiring developers to audit dependencies and remove the package.
- 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-2026-0018?
RUSTSEC-2026-0018 is a vulnerability in rpc-check, published on 24 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 6 versions published from 2026-02-20 onwards and had no evidence of actual usage. There were no crates depending on this crate on crates.io.
Thanks to Eren for finding and reporting this to the Rust security response working group, and to Emily Albini for co-ordinating with the crates.io team.
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-2026-0018?
1 open source package ship an affected version, including rpc-check.
| Package | Affected | Fixed in |
|---|---|---|
rpc-check crates.io | From 0.0.0-0 | None |
How do I fix RUSTSEC-2026-0018?
No fix has been published for RUSTSEC-2026-0018 yet. Limit exposure of the affected software until one is available.
Is RUSTSEC-2026-0018 being exploited?
There is no known exploitation of RUSTSEC-2026-0018 in the wild and no public exploit code.