# CVE-2026-92159: F Prime TlmPacketizer buffer overflow in telemetry handler

Source: https://junglewise.ai/threats/cve-2026-92159-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-2026-92159 · Severity: medium · CVSS 6.5 · Published 2026-10-14

F Prime is a framework used to develop spaceflight and embedded software applications. The TlmPacketizer component fails to validate the size of incoming telemetry data before copying it into fixed-size channel storage, allowing oversized values to overwrite adjacent memory. An attacker can send malformed telemetry packets to corrupt mission-critical telemetry output.

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

## Quick answers

**Is CVE-2026-92159 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92159 being exploited in the wild.

**How severe is CVE-2026-92159?** Medium severity, with a CVSS score of 6.5, published 14 October 2026.

**Which products and versions are affected?** Nasa F Prime prior to 4.3.0.

**Is there a fix for CVE-2026-92159?** Yes: fixed in 4.3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-92159 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-92159?** 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 4.3.0

## Technical details

A stack-based buffer overflow exists in Svc::TlmPacketizer's TlmRecv_handler, which copies telemetry serialized values into fixed-slot storage without bounds checking. When a channel value's serialized size exceeds the allocated slot size, the copy operation overwrites adjacent channel fields, corrupting packetized telemetry. This requires network access to send malformed telemetry packets to the affected component.

## Affected products

- NASA F Prime prior to 4.3.0

## Timeline

- 2026-10-14: disclosed

## References

- [https://github.com/nasa/fprime/commit/048fe04062b91be7af138df7e09cdd15812dde96](https://github.com/nasa/fprime/commit/048fe04062b91be7af138df7e09cdd15812dde96)
- [https://github.com/nasa/fprime/commit/7eacd551aaf6d9a21e347ac2c8d827ca15ee5755](https://github.com/nasa/fprime/commit/7eacd551aaf6d9a21e347ac2c8d827ca15ee5755)

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- [NASA F Prime FileDownlink integer overflow bypass](https://junglewise.ai/threats/cve-2026-92160-f-f-prime-is-a-framework-that-enables-development-and-deployment)
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- [F Prime FileDownlink SendPartial integer overflow denial of service](https://junglewise.ai/threats/cve-2026-92157-f-f-prime-is-a-framework-that-enables-development-and-deployment)
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- [F Prime FilePacket deserialization denial of service](https://junglewise.ai/threats/cve-2026-92155-f-f-prime-is-a-framework-that-enables-development-and-deployment)