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Vulnerability Details :

CVE-2026-29004

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-04 May, 2026 | 18:05
Updated At-06 May, 2026 | 13:46
Rejected At-
Credits

BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:04 May, 2026 | 18:05
Updated At:06 May, 2026 | 13:46
Rejected At:
▼CVE Numbering Authority (CNA)
BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS

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.

Affected Products
Vendor
vda-linux
Product
busybox_mirror
Default Status
affected
Versions
Affected
  • From 0 before 42202bfb1e6ac51fa995beda8be4d7b654aeee2a (git)
Problem Types
TypeCWE IDDescription
CWECWE-122CWE-122: Heap-based Buffer Overflow
Type: CWE
CWE ID: CWE-122
Description: CWE-122: Heap-based Buffer Overflow
Metrics
VersionBase scoreBase severityVector
4.07.2HIGH
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
3.18.1HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Version: 4.0
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.
finder
VulnCheck
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
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
Hyperlink: https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/
Resource:
technical-description
exploit
Hyperlink: https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a
Resource:
patch
Hyperlink: https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409
Resource:
patch
Hyperlink: https://busybox.net/
Resource:
product
Hyperlink: https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:04 May, 2026 | 18:16
Updated At:06 May, 2026 | 14:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.07.2HIGH
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.18.1HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Type: Secondary
Version: 4.0
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-122Secondarydisclosure@vulncheck.com
CWE ID: CWE-122
Type: Secondary
Source: disclosure@vulncheck.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://busybox.net/disclosure@vulncheck.com
N/A
https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2adisclosure@vulncheck.com
N/A
https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409disclosure@vulncheck.com
N/A
https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-serversdisclosure@vulncheck.com
N/A
https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/disclosure@vulncheck.com
N/A
Hyperlink: https://busybox.net/
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/
Source: disclosure@vulncheck.com
Resource: N/A

Change History

0
Information is not available yet

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1Records found
CVE-2026-23750
Matching Score-4
Assigner-VulnCheck
ShareView Details
Matching Score-4
Assigner-VulnCheck
CVSS Score-7.2||HIGH
EPSS-0.02% / 4.46%
||
7 Day CHG~0.00%
Published-26 Feb, 2026 | 17:33
Updated-23 Mar, 2026 | 15:44
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Golioth Pouch < [INSERT FIXED VERSION] BLE GATT Heap-based Buffer Overflow

Golioth Pouch version 0.1.0, prior to commit 1b2219a1, contains a heap-based buffer overflow in BLE GATT server certificate handling. server_cert_write() allocates a heap buffer of size CONFIG_POUCH_SERVER_CERT_MAX_LEN when receiving the first fragment, then appends subsequent fragments using memcpy() without verifying that sufficient capacity remains. An adjacent BLE client can send unauthenticated fragments whose combined size exceeds the allocated buffer, causing a heap overflow and crash; integrity impact is also possible due to memory corruption.

Action-Not Available
Vendor-Golioth
Product-Pouch
CWE ID-CWE-122
Heap-based Buffer Overflow
Details not found