CVE-2026-74225

HIGH 7.1

U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

U-Boot before 2026.10-rc5 contains out-of-bounds memory access in dhcp6_parse_options() that fails to validate SERVERID and CLIENTID option lengths from DHCPv6 packets. Attackers on the local network can send crafted DHCPv6 ADVERTISE or REPLY packets during netboot to corrupt memory and crash the bootloader.

CWE	CWE-787
Vendor	u-boot
Product	u-boot
Published	Sep 29, 2026

Stay Ahead of the Next One

Get instant alerts for u-boot u-boot

Be the first to know when new high vulnerabilities affecting u-boot u-boot are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

u-boot / u-boot

0 < 2026.10-rc5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/u-boot/u-boot/commit/20209a62bc8565fc1e040882bc03c71ff0d73076 github.com: https://github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.c#L304 github.com: https://github.com/u-boot/u-boot vulncheck.com: https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-out-of-bounds-write-via-dhcpv6

Credits

Shahriyar Jalayeri (ByteRay Ltd.) Mehrun P. Hunter (ByteRay Ltd.)