High 8.1Published May 4, 2026

CVE-2026-29004BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS

Updated under an hour ago (Oct 26, 2026, 8:23 PM ET)

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It affects vda-linux busybox_mirror and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for vda-linux busybox_mirror

Exploited in the last 30 days

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.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness (CWE): CWE-122, CWE-131
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

vda-linux busybox_mirror vda_linux:busybox_mirror (from the name)	before 42202bfb1e6ac51fa995beda8be4d7b654aeee2a	CNA record
Red Hat Red Hat Hardened Images redhat:hummingbird	from 1.37.0-7.3.hum1 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 6 redhat:enterprise_linux	6	CISA ADP

References

References

https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/	technical-description, exploit
https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a	patch
https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409	patch
https://busybox.net/	product
https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers	third-party-advisory
https://access.redhat.com/errata/RHSA-2026:30652
https://access.redhat.com/security/cve/CVE-2026-29004
https://bugzilla.redhat.com/show_bug.cgi?id=2466526
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29004.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.