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RSSN has Arbitrary Code Execution via Unvalidated JIT Instruction Generation in C-FFI InterfaceGHSA-9c4h-pwmf-m6fj

GHSA-9c4h-pwmf-m6fj is a Code Injection vulnerability in rssn. A fix is available for rssn — see the affected versions and patch details below.

Also known asCVE-2026-30960RUSTSEC-2026-0038
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-9c4h-pwmf-m6fj.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs12th percentile — riskier than 12% of all scored CVEsHighest risk
0.00%0.24%0.48%0.72%0.0%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected
🦀rssn

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Vulnerability Type: Improper Control of Generation of Code ('Code Injection') (CWE-94) / Improper Check for Unusual or Exceptional Conditions (CWE-754) / Improper Input Validation (CWE-20) / Use of Low-Level Functionality (CWE-695) / Improper Privilege Management (CWE-269) / External Control of System or Configuration Setting (CWE-15).

Technical Details: The vulnerability exists in the JIT (Just-In-Time) compilation engine, which is fully exposed via the CFFI (Foreign Function Interface). Due to Improper Input Validation and External Control of Code Generation, an attacker can supply malicious parameters or instruction sequences through the CFFI layer. Since the library often operates with elevated privileges or within high-performance computing contexts, this allows for Arbitrary Code Execution (ACE) at the privilege level of the host process.

Who is Impacted?

  • Developers using the library as a dynamic linked library (.so, .dll, .dylib) in multi-language environments (e.g., Python, Node.js, C++).
  • Cloud Service Providers running the library in multi-tenant environments or automated model-training pipelines.
  • Users processing untrusted or third-party datasets/models that may trigger malicious JIT instruction generation. Patches
  • Affected versions: < 0.2.8
  • Patched version: 0.2.9

Workarounds

If you cannot upgrade immediately, please consider the following mitigations:

  • Strict Sandboxing: Run the library within a restricted sandbox (e.g., WebAssembly, Docker with non-root user, or seccomp profiles) to limit system call access.
  • Principle of Least Privilege: Ensure the process calling the library does not have administrative or root privileges.
  • Input Filtering: If possible, implement an application-level validation layer to sanitize any data passed to the CFFI interfaces.
  • Disable JIT (if applicable): If your workload allows, use the interpreter-only mode (if provided by the library) to bypass the JIT engine entirely. CVSS Score
  • Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  • Base Score: 9.4 (Critical)

References

Apich Organization Security Team Homepage

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iorssnall versions0.2.9cargo update -p rssn --precise 0.2.9

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rssn, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update rssn to 0.2.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9c4h-pwmf-m6fj is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

## Impact **Vulnerability Type**: Improper Control of Generation of Code ('Code Injection') (CWE-94) / Improper Check for Unusual or Exceptional Conditions (CWE-754) / Improper Input Validation (CWE-20) / Use of Low-Level Functionality (CWE-695) / Improper Privilege Management (CWE-269) / External Control of System or Configuration Setting (CWE-15). **Technical Details**: The vulnerability exists in the JIT (Just-In-Time) compilation engine, which is fully exposed via the CFFI (Foreign Function Interface). Due to Improper Input Validation and External Control of Code Generation, an attacker
O3 Security · Impact-Aware SCA

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