Rust advisories / polymarkets-client-sdk
VulnerabilityRUSTSEC-2026-0015 · polymarkets-client-sdk
RUSTSEC-2026-0015: `polymarkets-client-sdk` was removed from crates.io for malicious code
Short answerA security vulnerability in the polymarkets-client-sdk crate: `polymarkets-client-sdk` was removed from crates.io for malicious code. No severity score was published. No fixed version: replace the crate or remove the affected code path.
| Crate | polymarkets-client-sdk |
|---|---|
| Type | Vulnerability (malicious) |
| Affected versions | Every version. |
| Fixed in | none |
| Severity | not scored |
| Published | 2026-02-19 |
| Last changed | 2026-03-17 |
| Also known as | none |
What to do
- Find who pulls it in:
cargo tree -i polymarkets-client-sdk. - Avoid the affected API, or replace the crate.
Details from the advisory
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.
References
- Package: crates.io/crates/polymarkets-client-sdk
- Advisory: rustsec.org/advisories/RUSTSEC-2026-0015.html
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
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