Use of Low-Level Functionality Affecting rssn package, versions <0.2.9
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-RSSN-15443524
- published10 Mar 2026
- disclosed10 Mar 2026
- creditXinyu Yang
Introduced: 10 Mar 2026
NewCVE-2026-30960 (opens in a new tab)How to fix?
Upgrade rssn to version 0.2.9 or higher.
Overview
Affected versions of this package are vulnerable to Use of Low-Level Functionality through the CFFI interface. An attacker can execute arbitrary code with the privileges of the host process by supplying malicious parameters or instruction sequences to the JIT compilation engine. This is only exploitable if the process loads untrusted input through the CFFI interface or operates in a context where attacker-controlled data can reach the JIT engine.
Workaround
This vulnerability can be mitigated by running the library within a restricted sandbox (such as WebAssembly, Docker with non-root user, or seccomp profiles), ensuring the process does not have administrative privileges, implementing application-level validation to sanitize data passed to the CFFI interfaces, or disabling the JIT engine if interpreter-only mode is available.