Vulnerability · Published Oct 14, 2026 · Assigned by GitHub_M

CVE-2026-92157F´: FileDownlink SendPartial integer overflow lets legal startOffset/length values reach a reachable assertion

Medium 6.5

In plain English

A medium-severity integer overflow in fprime from nasa. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.6%top 51.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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::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.

Affected products (as reported)

Vendor	Product	Versions
nasa	fprime	< 4.3.0

Weakness: CWE-190, CWE-617 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/nasa/fprime/security/advisories/GHSA-hcmw-g425-8h9g x_refsource_CONFIRM
https://github.com/nasa/fprime/pull/5565 x_refsource_MISC
https://github.com/nasa/fprime/commit/33fe2a4fe3fd5ff1b14985669fbad09f070e9914 x_refsource_MISC
https://github.com/nasa/fprime/commit/95eeb5cfb44e5609eff0887f0e11e640cdacef6b x_refsource_MISC
https://github.com/nasa/fprime/releases/tag/v4.3.0 x_refsource_MISC