RSSN has Arbitrary Code Execution via Unvalidated JIT Instruction Generation in C-FFI Interface

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

9.4 · 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 · score source

EPSS

• CVE-2026-30960: 0.20% estimated exploitation activity in the next 30 days; percentile 10.40 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.,…

Published by the source

10 Mar 2026, 01:19 UTC

Last modified by the source

10 Mar 2026, 18:40 UTC

Source last checked

26 Oct 2026, 15:42 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-9c4h-pwmf-m6fj

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# Patch Next advisory brief: CVE-2026-30960

Advisory: RSSN has Arbitrary Code Execution via Unvalidated JIT Instruction Generation in C-FFI Interface
IDs: CVE-2026-30960, GHSA-9c4h-pwmf-m6fj
Record: https://patchnext.com/advisories/cve-2026-30960 (revision 1, source checked 26 Oct 2026, 15:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: rssn 0.2.9. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io rssn: affected < 0.2.9; fixed in 0.2.9

## Suggested inspection (read-only)
- crates.io rssn: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on rssn.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-9c4h-pwmf-m6fj (GitHub-reviewed advisory GHSA-9c4h-pwmf-m6fj lists affected ranges: crates.io rssn >=0 <0.2.9)

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