Vulnerability · Published Apr 3, 2026 · Assigned by VulDB

CVE-2026-5474NASA cFS CCSDS Packet Header to_lab_passthru_encode.c CFE_MSG_GetSize heap-based overflow

Medium 6.3

In plain English

A medium-severity heap buffer overflow 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 34% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.4%top 66.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was found in NASA cFS up to 7.0.0. This affects the function CFE_MSG_GetSize of the file apps/to_lab/fsw/src/to_lab_passthru_encode.c of the component CCSDS Packet Header Handler. Performing a manipulation results in heap-based buffer overflow. The attacker must have access to the local network to execute the attack. The project was informed of the problem early through an issue report but has not responded yet.

Affected products (as reported)

Vendor	Product	Versions
NASA	cFS	7.0

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R

References

VDB-355078 | NASA cFS CCSDS Packet Header to_lab_passthru_encode.c CFE_MSG_GetSize heap-based overflow vdb-entry, technical-description
VDB-355078 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #781950 | NASA cFS 7.0.0 Heap over-read via untrusted CCSDS length in TO_LAB sendto third-party-advisory
https://github.com/nasa/cFS/issues/952 issue-tracking
https://github.com/nasa/cFS/ product