Vulnerability · Published Oct 14, 2026 · Assigned by GitHub_M

CVE-2026-92154F´: File size bounds bypass in Svc::FileUplink via unsigned integer overflow in DATA packet validation

High 8.1

In plain English

A high-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 50% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.6%top 50.4% 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 4.2.0, Svc::FileUplink handleDataPacket offset and size validation is vulnerable because the component checks byteOffset plus dataSize with wrapping U32 arithmetic and then seeks to the large attacker-controlled offset before writing. When a file-uplink DATA packet supplies a byteOffset and dataSize whose unsigned sum wraps below the declared file size, data can be written beyond the declared upload size, causing file integrity loss and potentially large sparse-file growth or resource exhaustion. This issue is fixed in version 4.2.0.

Affected products (as reported)

Vendor	Product	Versions
nasa	fprime	< 4.2.0

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

References

https://github.com/nasa/fprime/security/advisories/GHSA-wx8q-q5gx-f54p x_refsource_CONFIRM
https://github.com/nasa/fprime/pull/4919 x_refsource_MISC
https://github.com/nasa/fprime/commit/cacdd555456bd83ab395b521d56c0330470ea798 x_refsource_MISC