High severity8.1NVD Advisory· Published May 4, 2026· Updated May 6, 2026
CVE-2026-29004
CVE-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.
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Affected products
5- osv-coords3 versionspkg:rpm/opensuse/busybox&distro=openSUSE%20Tumbleweedpkg:rpm/suse/busybox&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/busybox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 1.37.0-11.1+ 2 more
- (no CPE)range: < 1.37.0-11.1
- (no CPE)range: < 1.37.0-160000.6.1
- (no CPE)range: < 1.37.0-160000.6.1
Patches
Vulnerability mechanics
References
5- busybox.netnvd
- github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2anvd
- github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409nvd
- www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-serversnvd
- y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/nvd
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