CVE-2026-29004HIGH 8.1EPSS p24.0%
CVE-2026-29004CVE-2026-29004
Description
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.
Scoring
| CVSS 3.1 | 8.1 (HIGH) |
| Vector | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| EPSS | 0.32% probability of exploitation · percentile 24.0% · 2026-06-19T12:03:05Z |
| Published | 2026-05-04 |
| Last modified | 2026-05-06 |
Underlying weaknesses· 1
References
- https://busybox.net/
- https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a
- https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409
- https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers
- https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Heap-based Buffer Overflowcwe-122 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.