CVE catalog
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 attack
- Severity
- High · CVSS 8.8
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.38% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | busybox | sid | 1:1.38.0-3 | vulnerable |
| Debian | busybox | forky | 1:1.38.0-3 | vulnerable |
| Debian | busybox | trixie | 1:1.37.0-6 | vulnerable |
| Debian | busybox | bookworm | 1:1.35.0-4+deb12u1 | vulnerable |
| Cpe | busybox | Not reported | Not reported | vulnerable |
| Suse | busybox | linux enterprise server 16.0 | 1.37.0-160000.6.1 | fixed |
| Suse | busybox | linux enterprise server for sap applications 16.0 | 1.37.0-160000.6.1 | fixed |
| Opensuse | busybox | tumbleweed | 1.37.0-11.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | busybox | source | sid | (unfixed) | not yet assigned | Not reported | [1136012] |
| Debian | busybox | source | forky | (unfixed) | not yet assigned | Not reported | [1136012] |
| Debian | busybox | source | trixie | (unfixed) | not yet assigned | Not reported | [1136012] |
| Debian | busybox | source | bookworm | (unfixed) | not yet assigned | Not reported | [1136012] |
| Suse | busybox | rpm | linux enterprise server 16.0 | 1.37.0-160000.6.1 | Not reported | SUSE-SU-2026:22020-1 | Not reported |
| Suse | busybox | rpm | linux enterprise server for sap applications 16.0 | 1.37.0-160000.6.1 | Not reported | SUSE-SU-2026:22020-1 | Not reported |
| Opensuse | busybox | rpm | tumbleweed | 1.37.0-11.1 | Not reported | OPENSUSE-SU-2026:10740-1 | Not reported |
Notes
[trixie] busybox: Minor issue [bookworm] busybox: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [busybox]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- [busybox-static]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- [busybox-syslogd]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1· all · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
1:1.35.0-4+deb12u1· all · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- [udhcpc]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- [udhcpd]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
[Debian 13 (Trixie)]
- [busybox]Affected
Source package: [busybox]
Details (2)
1:1.37.0-6+b8· amd64 · trixieAffected
nvd · busybox · debian · 13
1:1.37.0-6+b8· arm64 · trixieAffected
nvd · busybox · debian · 13
- [busybox-static]Affected
Source package: [busybox]
Details (2)
1:1.37.0-6+b8· amd64 · trixieAffected
nvd · busybox · debian · 13
1:1.37.0-6+b8· arm64 · trixieAffected
nvd · busybox · debian · 13
- [busybox-syslogd]Affected
Source package: [busybox]
Details (2)
1:1.37.0-6· all · trixieAffected
nvd · busybox · debian · 13
1:1.37.0-6· all · trixieAffected
nvd · busybox · debian · 13
- [udhcpc]Affected
Source package: [busybox]
Details (2)
1:1.37.0-6· all · trixieAffected
nvd · busybox · debian · 13
1:1.37.0-6· all · trixieAffected
nvd · busybox · debian · 13
- [udhcpd]Affected
Source package: [busybox]
Details (2)
1:1.37.0-6· all · trixieAffected
nvd · busybox · debian · 13
1:1.37.0-6· all · trixieAffected
nvd · busybox · debian · 13
[openSUSE Tumbleweed]
- [busybox-static]Unknown
Source package: [busybox]
Details (1)
1.38.0-2.1· x86_64 · tumbleweedUnknown · Fixed:
1.37.0-11.1Version impact unknown
nvd · busybox · opensuse · tumbleweed
- [busybox-testsuite]Unknown
Source package: [busybox]
Details (1)
1.38.0-2.1· x86_64 · tumbleweedUnknown · Fixed:
1.37.0-11.1Version impact unknown
nvd · busybox · opensuse · tumbleweed
- [busybox-warewulf3]Unknown
Source package: [busybox]
Details (1)
1.38.0-2.1· x86_64 · tumbleweedUnknown · Fixed:
1.37.0-11.1Version impact unknown
nvd · busybox · opensuse · tumbleweed
- [busybox]Fixed
Source package: [busybox]
Details (1)
1.38.0-2.1· x86_64 · tumbleweedFixed · Fixed:
1.37.0-11.1nvd · busybox · opensuse · tumbleweed
Observed:
References
- [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://busybox.net/]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10740-1.json]
- [https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a]
- [https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-29004]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-29004]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22020-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10740-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-29004]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29004.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1356.json]
- [https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers]
- [https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]