High
busybox — security advisory
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.
- Products
- busybox
- Affected versions
- 1:1.20.0-8.1ubuntu1, 1:1.20.0-9ubuntu1, 1:1.20.0-9ubuntu2, 1:1.21.0-1ubuntu1, 1:1.21.0-1ubuntu1.4, 1:1.21.0-1ubuntu1.4+esm1, 1:1.22.0-15ubuntu1, 1:1.22.0-15ubuntu1.4, 1:1.22.0-15ubuntu1.4+esm1, 1:1.22.0-15ubuntu1.4+esm2, 1:1.22.0-19ubuntu2, 1:1.27.2-1ubuntu3, 1:1.27.2-1ubuntu4, 1:1.27.2-2ubuntu2, 1:1.27.2-2ubuntu3, 1:1.27.2-2ubuntu3.1, 1:1.27.2-2ubuntu3.2, 1:1.27.2-2ubuntu3.3, 1:1.27.2-2ubuntu3.4, 1:1.27.2-2ubuntu3.4+esm1, 1:1.30.1-4ubuntu4, 1:1.30.1-4ubuntu5, 1:1.30.1-4ubuntu6, 1:1.30.1-4ubuntu6.1, 1:1.30.1-4ubuntu6.2, 1:1.30.1-4ubuntu6.3, 1:1.30.1-4ubuntu6.4, 1:1.30.1-4ubuntu6.5, 1:1.30.1-6ubuntu3, 1:1.30.1-7ubuntu1, 1:1.30.1-7ubuntu2, 1:1.30.1-7ubuntu3, 1:1.30.1-7ubuntu3.1, 1:1.36.1-3ubuntu1, 1:1.36.1-6ubuntu1, 1:1.36.1-6ubuntu3, 1:1.36.1-6ubuntu3.1, 1:1.37.0-10.1ubuntu2, 1:1.37.0-10.1ubuntu3, 1:1.37.0-4ubuntu1, 1:1.37.0-7ubuntu1, 1:1.38.0-3ubuntu1, 1:1.38.0-3ubuntu3, 1:1.38.0-3ubuntu4
- Fixed versions
- Not specified
- CVEs
- CVE-2026-29004
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:58 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-29004
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
Complete source record
{
"id": "6ea0be974d251abfbddaa84c6c17df9b67d048b6426a6a8e250618693fdf3a7a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-29004",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-29004",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-29004",
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{
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"evidence": "/affected/3/versions"
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{
"value": "1:1.30.1-4ubuntu6.2",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.30.1-4ubuntu6.3",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.30.1-4ubuntu6.4",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.30.1-4ubuntu6.5",
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{
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{
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{
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{
"name": {
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"evidence": "/affected/7/versions"
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"structured": {
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"aliases": [
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},
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},
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},
{
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},
{
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},
{
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}
]
}
},
{
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"ecosystem": "Ubuntu:26.10"
},
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"1:1.37.0-7ubuntu1",
"1:1.37.0-10.1ubuntu2",
"1:1.37.0-10.1ubuntu3",
"1:1.38.0-3ubuntu1",
"1:1.38.0-3ubuntu3",
"1:1.38.0-3ubuntu4"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "busybox",
"binary_version": "1:1.38.0-3ubuntu4"
},
{
"binary_name": "busybox-static",
"binary_version": "1:1.38.0-3ubuntu4"
},
{
"binary_name": "busybox-syslogd",
"binary_version": "1:1.38.0-3ubuntu4"
},
{
"binary_name": "udhcpc",
"binary_version": "1:1.38.0-3ubuntu4"
},
{
"binary_name": "udhcpd",
"binary_version": "1:1.38.0-3ubuntu4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "busybox",
"purl": "pkg:deb/ubuntu/busybox?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1:1.37.0-4ubuntu1",
"1:1.37.0-7ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29004.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "busybox",
"binary_version": "1:1.37.0-7ubuntu1"
},
{
"binary_name": "busybox-initramfs",
"binary_version": "1:1.37.0-7ubuntu1"
},
{
"binary_name": "busybox-static",
"binary_version": "1:1.37.0-7ubuntu1"
},
{
"binary_name": "busybox-syslogd",
"binary_version": "1:1.37.0-7ubuntu1"
},
{
"binary_name": "udhcpc",
"binary_version": "1:1.37.0-7ubuntu1"
},
{
"binary_name": "udhcpd",
"binary_version": "1:1.37.0-7ubuntu1"
}
]
}
}
],
"modified": "2026-10-17T12:59:56.804097050Z",
"provider": "osv",
"upstream": [
"CVE-2026-29004"
],
"references": [
"https://ubuntu.com/security/CVE-2026-29004",
"https://www.cve.org/CVERecord?id=CVE-2026-29004"
]
},
"related_cves": [
{
"value": "CVE-2026-29004",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360017,
"published_at": "2026-05-04T18:16:00+00:00"
}