Buffer overflow in Vda-Linux Busybox Mirror
CVE-2026-29004
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Vda-Linux Busybox Mirror — versions 0
Weakness classification (CWE)
References
- busybox.net/ (product)
- github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654ae… (patch)
- github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d… (patch)
- www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns… (third-party-advisory)
- y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/ (technical-description, exploit)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-29004?
- CVE-2026-29004 is a high-severity vulnerability in Vda-Linux Busybox Mirror, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-05-04.
- How severe is CVE-2026-29004?
- High severity. CVSS v3 base score is 8.1 out of 10.