CVE-2026-46728

Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because...

8.2 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.21%Up 0.2 points since May 17, 2026

What each source reports

CVE List Score used 8.2

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

Record: CVE-2026-46728
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-346
Updated: 2026-11-02

EUVDEUVD-2026-30673 8.2

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

Record: EUVD-2026-30673
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-5cv5-vm4q-7wmx 8.2

Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because...

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

Record: GHSA-5cv5-vm4q-7wmx
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-346
Updated: 2026-11-02

NVD 8.2

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

Record: CVE-2026-46728
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-346
Updated: 2026-11-02

OSVCVE-2026-33243 8.2

barebox: FIT Signature Verification Bypass Vulnerability

barebox is a bootloader. In barebox from version 2016.03.0 to before version 2026.03.1 (and the corresponding backport to 2025.09.3), an attacker could exploit a FIT signature verification vulnerability to trick the bootloader into booting different images than those that were verified as part of a signed configuration. mkimage(1) sets the hashed-nodes property of the FIT signature node to list which nodes of the FIT were hashed as part of the signing process as these will need to be verified later on by the bootloader. However, hashed-nodes itself is not part of the hash and could therefore be modified to allow booting different images than those that have been verified. This issue has been patched in barebox versions 2026.03.1 and backported to 2025.09.3.

Record: CVE-2026-33243
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-345
Updated: 2026-11-02

OSV 8.2

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

Record: CVE-2026-46728
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-346
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-46728 8.8

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

Record: DEBIAN-CVE-2026-46728
CVSS 3.1: 8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-46728 8.2

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

Record: UBUNTU-CVE-2026-46728
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`u-boot` Debian:12	before 2023.01+dfsg-2+deb12u3, plus listed versions 2023.01+dfsg-22023.01+dfsg-2+deb12u12023.01+dfsg-2+deb12u2	2023.01+dfsg-2+deb12u3
`u-boot` Debian:13	before 2025.01-3+deb13u1, plus listed versions 2025.01-3	2025.01-3+deb13u1
`u-boot` Debian:14	before 2025.01-3.2, plus listed versions 2025.01-32025.01-3.1	2025.01-3.2
`u-boot` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 2015.04+dfsg1-2ubuntu12015.10+dfsg1-22015.10+dfsg1-32015.10+dfsg1-42016.01+dfsg1-1 Show 7 moreShow less 2016.01+dfsg1-1ubuntu12016.01+dfsg1-2ubuntu12016.01+dfsg1-2ubuntu22016.01+dfsg1-2ubuntu32016.01+dfsg1-2ubuntu52016.01+dfsg1-2ubuntu5+esm12016.01+dfsg1-2ubuntu5+esm2	None known
`u-boot` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 2016.03+dfsg1-6ubuntu22018.07~rc3+dfsg1-0ubuntu1~18.04.12018.07~rc3+dfsg1-0ubuntu2~18.04.12018.07~rc3+dfsg1-0ubuntu3~18.04.12019.07+dfsg-1ubuntu4~18.04.1 Show 4 moreShow less 2020.10+dfsg-1ubuntu0~18.04.22020.10+dfsg-1ubuntu0~18.04.32020.10+dfsg-1ubuntu0~18.04.3+esm12020.10+dfsg-1ubuntu0~18.04.3+esm2	None known
`u-boot` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 2019.07+dfsg-1ubuntu32019.07+dfsg-1ubuntu52019.07+dfsg-1ubuntu62020.10+dfsg-1ubuntu0~20.04.22021.01+dfsg-3ubuntu0~20.04.1 Show 6 moreShow less 2021.01+dfsg-3ubuntu0~20.04.32021.01+dfsg-3ubuntu0~20.04.42021.01+dfsg-3ubuntu0~20.04.52021.01+dfsg-3ubuntu0~20.04.62021.01+dfsg-3ubuntu0~20.04.6+esm12021.01+dfsg-3ubuntu0~20.04.6+esm2	None known
`u-boot` Ubuntu:22.04:LTS	All versions, plus listed versions 2021.07+dfsg-0ubuntu82021.07+dfsg-0ubuntu92021.07+dfsg-0ubuntu102022.01+dfsg-2ubuntu12022.01+dfsg-2ubuntu2 Show 8 moreShow less 2022.01+dfsg-2ubuntu2.12022.01+dfsg-2ubuntu2.32022.01+dfsg-2ubuntu2.42022.01+dfsg-2ubuntu2.52022.01+dfsg-2ubuntu2.62022.01+dfsg-2ubuntu2.72022.01+dfsg-2ubuntu2.82022.01+dfsg-2ubuntu2.9	None known
`u-boot-nezha` Ubuntu:22.04:LTS	All versions, plus listed versions 2021.09+git20211008.62392d3-0ubuntu12022.04+git20220405.7446a472-0ubuntu0.12022.04+git20220405.7446a472-0ubuntu0.22022.04+git20220405.7446a472-0ubuntu0.32022.04+git20220405.7446a472-0ubuntu0.4	None known
`u-boot` Ubuntu:24.04:LTS	All versions, plus listed versions 2023.07+dfsg-1ubuntu22024.01+dfsg-1ubuntu12024.01+dfsg-1ubuntu22024.01+dfsg-1ubuntu32024.01+dfsg-1ubuntu4 Show 9 moreShow less 2024.01+dfsg-1ubuntu52024.01+dfsg-1ubuntu5.12024.01+dfsg-1ubuntu5.22025.01-0ubuntu0.24.04.12025.01-0ubuntu0.24.04.22025.10-0ubuntu0.24.04.12025.10-0ubuntu0.24.04.22025.10-0ubuntu0.24.04.32025.10-0ubuntu0.24.04.4	None known
`u-boot-nezha` Ubuntu:24.04:LTS	All versions, plus listed versions 2022.10-1089-g528ae9bc6c-0ubuntu22024.01~rc1-190-g2e89b706f5-0ubuntu12024.01~rc1-190-g2e89b706f5-0ubuntu22024.01~rc1-190-g2e89b706f5-0ubuntu2.24.04.2	None known
`u-boot` Ubuntu:25.10	All versions, plus listed versions 2025.01-1~0ubuntu22025.01-3ubuntu12025.01-3ubuntu22025.01-3ubuntu42025.10-0ubuntu0.25.10.1	None known
`u-boot` Ubuntu:26.10	All versions, plus listed versions 2025.10-0ubuntu22025.10-0ubuntu32025.10-0ubuntu42025.10-0ubuntu52025.10-0ubuntu6	None known
`u-boot` Ubuntu:26.04:LTS	All versions, plus listed versions 2025.01-3ubuntu42025.10-0ubuntu12025.10-0ubuntu22025.10-0ubuntu2.12025.10-0ubuntu2.2	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-46728 is a high vulnerability (CVSS 8.2) in Denx U-boot, published March 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 11th percentile. Fixed in u-boot 2023.01+dfsg-2+deb12u3.

References

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