CVE-2026-29004
BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.
| CWE | CWE-122 |
| Vendor | vda-linux |
| Product | busybox_mirror |
| Published | May 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected Versions
vda-linux / busybox_mirror
0 < 42202bfb1e6ac51fa995beda8be4d7b654aeee2a
References
github.com: https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a github.com: https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409 busybox.net: https://busybox.net/ vulncheck.com: https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers
Credits
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. VulnCheck