CVE-2026-46728: Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because hashed-nodes is o

Routine

HIGH 8.2UPGRADE

CVE-2026-46728 is a high-severity flaw (CVSS 8.2) affecting u-boot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-05-16
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: denx

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-16 22:16 UTCPublished CVE record published
2026-10-26 13:10 UTCUpdated Record last modified

denx u-boot UPGRADE

Affected: >= 2013.07 and < 2026.04 · 2026.04 rc1 · 2026.04 rc2 · 2026.04 rc3

Fixed in: 2026.04

Safe to downgrade to: a release before 2013.07

1. Check installed version

apt-cache policy u-boot || rpm -q u-boot || u-boot --version

2. UPGRADE to 2026.04 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade u-boot

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade u-boot

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2013.07 (Debian / Ubuntu)

apt-cache madison u-boot sudo apt install u-boot=<VERSION_BEFORE_2013.07> sudo apt-mark hold u-boot

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list u-boot sudo dnf downgrade u-boot-<VERSION_BEFORE_2013.07> sudo dnf versionlock add u-boot

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-46728?

u-boot: upgrade to 2026.04. Exact commands for each OS are on this page.

Is CVE-2026-46728 being exploited?

CVE-2026-46728 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-46728 affect?

CVE-2026-46728 affects u-boot. Severity is high (CVSS 8.2). Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because hashed-nodes is omitted from a hash.

How urgent is CVE-2026-46728?

Priority 37/100. High severity; Public exploit reference

Related CVEs

CVE-2026-29009 HIGH 8.2 UPGRADE U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c)

References

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