Vulnerability · Published Aug 30, 2026 · Assigned by VulDB

CVE-2026-82480NASA cFS cFE Software Bus cfe_sb_util.c CFE_SB_GetUserDataLength integer underflow

High 7.4

In plain English

A high-severity security flaw in cFS from NASA. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.4%top 68.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security flaw has been discovered in NASA cFS up to 7.0.1. The affected element is the function CFE_SB_GetUserDataLength of the file src/cFS/cfe/modules/sb/fsw/src/cfe_sb_util.c of the component cFE Software Bus. Performing a manipulation of the argument TotalMsgSize/HdrSize results in integer underflow. It is possible to initiate the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products (as reported)

Vendor	Product	Versions
NASA	cFS	7.0.07.0.1

Weakness: CWE-191, CWE-189 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L/E:X/RL:X/RC:R

References

VDB-397030 | NASA cFS cFE Software Bus cfe_sb_util.c CFE_SB_GetUserDataLength integer underflow vdb-entry, technical-description
VDB-397030 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-82480 | CVE Analysis and Report third-party-advisory
Submit #888018 | NASA cFS 7.0.1 Integer Underflow third-party-advisory