# CVE-2026-92158: F Prime integer wraparound in FpySequencer STORE bounds check

Source: https://junglewise.ai/threats/cve-2026-92158-f-f-prime-is-a-framework-that-enables-development-and-deployment  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-92158 · Severity: high · CVSS 7.2 · Published 2026-10-14

F Prime is a framework for developing spaceflight and embedded software applications. A flaw in the FpySequencer component allows an attacker to supply sequence directives with crafted stack offset and size values that wrap around integer boundaries, bypassing bounds validation. This enables an attacker to write outside the allocated sequencer stack memory, causing data corruption, crashes, or potentially executing arbitrary code on affected spacecraft or embedded systems.

Technologies: [Nasa F Prime](https://junglewise.ai/threats/technologies/f-prime). Vendors: [Nasa](https://junglewise.ai/threats/vendors/nasa).

## Quick answers

**Is CVE-2026-92158 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92158 being exploited in the wild.

**How severe is CVE-2026-92158?** High severity, with a CVSS score of 7.2, published 14 October 2026.

**Which products and versions are affected?** Nasa F Prime prior to 4.2.0.

**Is there a fix for CVE-2026-92158?** Yes: fixed in 4.2.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-92158 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-92158?** Check whether you run Nasa F Prime at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 4.2.0

## Technical details

The vulnerability is an integer wraparound in the bounds check of the FpySequencer STORE directive: when a sequence-controlled STORE directive supplies a stack offset and size whose sum wraps around a 32-bit integer, the validation fails to catch the out-of-range access before memcpy is called. An attacker with the ability to craft or inject sequence directives can trigger out-of-bounds memory writes, leading to heap corruption, denial of service, or code execution. The fix was introduced in F Prime 4.2.0.

## Affected products

- NASA F Prime prior to 4.2.0

## Timeline

- 2026-10-14: disclosed

## References

- [https://github.com/nasa/fprime/commit/7527430d9ae7c88f3d649d376a45c866b0aed595](https://github.com/nasa/fprime/commit/7527430d9ae7c88f3d649d376a45c866b0aed595)
- [https://github.com/nasa/fprime/pull/4534](https://github.com/nasa/fprime/pull/4534)

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