---
id: CVE-2026-92157
title: >-
  F´ (F Prime) is a framework that enables development and deployment of
  spaceflight and other embedded software applications
summary: >-
  F´ (F Prime) is a framework that enables development and deployment of
  spaceflight and other embedded software applications. Prior to 4.3.0,
  Svc::FileDownlink SendPartial range validation is vulnerable because unchecked
  startOffset plus …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-190
  - CWE-617
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T18:19:35.073'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92157'
references:
  - url: >-
      https://github.com/nasa/fprime/commit/33fe2a4fe3fd5ff1b14985669fbad09f070e9914
    label: security-advisories@github.com
  - url: >-
      https://github.com/nasa/fprime/commit/95eeb5cfb44e5609eff0887f0e11e640cdacef6b
    label: security-advisories@github.com
  - url: 'https://github.com/nasa/fprime/pull/5565'
    label: security-advisories@github.com
  - url: 'https://github.com/nasa/fprime/releases/tag/v4.3.0'
    label: security-advisories@github.com
  - url: 'https://github.com/nasa/fprime/security/advisories/GHSA-hcmw-g425-8h9g'
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-14T18:47:39.322Z'
---

## Overview

F´ (F Prime) is a framework that enables development and deployment of spaceflight and other embedded software applications. Prior to 4.3.0, Svc::FileDownlink SendPartial range validation is vulnerable because unchecked startOffset plus length arithmetic bypasses the range check and stores a wrapped m_endOffset that is inconsistent with m_byteOffset. When an existing source file is larger than a valid startOffset and a SendPartial command supplies a length whose U32 sum with that offset wraps below the file size, under standard F Prime assertion handling, the first data-packet transition reaches FW_ASSERT and aborts or resets the process, causing denial of service. This issue is fixed in version 4.3.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.