---
title: "CVE-2026-30960: RSSN has Arbitrary Code Execution via Unvalidated JIT Instruction Generation in C-FFI Interface"
url: https://erroneo.us/security/cve/CVE-2026-30960/
description: "CVE-2026-30960 (rssn (crates.io (Rust))): rssn is a scientific computing library for Rust, combining a high-performance symbolic computation engine with…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-10
date_modified: 2026-03-10
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-30960"
kev: false
cvss: 9.4
epss: 0.00203
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-30960: RSSN has Arbitrary Code Execution via Unvalidated JIT Instruction Generation in C-FFI Interface

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.2% , percentile 10: FIRST’s model estimates a 0.2% chance of exploitation activity in the next 30 days, higher than 10% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.
- Only applies if your dependency tree includes rssn (crates.io (Rust)) < 0.2.9, fixed in 0.2.9 . Check your lockfile, including transitive dependencies.

## What it is

rssn is a scientific computing library for Rust, combining a high-performance symbolic computation engine with numerical methods support and physics simulations functionalities. 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.

## Affected packages

- crates.io (Rust) `rssn` < 0.2.9 → fixed: 0.2.9

## Affected products (CVE record)

- Apich-Organization rssn: < 0.2.9

## Severity

- GitHub_M 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`
- GitHub 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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.20% probability of exploitation activity in the next 30 days; percentile 10.

## Sources

- [GitHub Advisory GHSA-9c4h-pwmf-m6fj](https://github.com/advisories/GHSA-9c4h-pwmf-m6fj)
- [CVE.org record CVE-2026-30960](https://www.cve.org/CVERecord?id=CVE-2026-30960)
- [NVD entry CVE-2026-30960](https://nvd.nist.gov/vuln/detail/CVE-2026-30960)
- [github.com](https://github.com/Apich-Organization/rssn/security/advisories/GHSA-9c4h-pwmf-m6fj)
- [github.com](https://github.com/Apich-Organization/rssn/releases/tag/v0.2.9)
- [rustsec.org](https://rustsec.org/advisories/RUSTSEC-2026-0038.html)

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Source page: https://erroneo.us/security/cve/CVE-2026-30960/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt