CVE & CISA-KEV Catalog

CVE-2026-29004

HIGH
8.1
CVSS v3
NVD

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.

CWE-122Heap-based Buffer OverflowCWE-131

How to fix

Remediation Available
busyboxRed Hat / RHEL
Fixed in:main@aarch64RHSA-2026:30652
Fixed in:main@srcRHSA-2026:30652
Fixed in:main@x86_64RHSA-2026:30652
busyboxRocky
Fixed in:main@aarch64RHSA-2026:30652
Fixed in:main@srcRHSA-2026:30652
Fixed in:main@x86_64RHSA-2026:30652

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Exploit Intelligence

0.38%probability of exploitation in 30 days
31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2015-3113Critical9.8100%KEVFix
CVE-2020-25687Medium5.987%-Fix
CVE-2009-3459High8.887%KEVFix
CVE-2021-21017High8.886%KEV-
CVE-2020-25683Medium5.986%-Fix
CVE-2023-27997Critical9.886%KEV + Ransom-

Common questions

How do I fix CVE-2026-29004?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-29004 being actively exploited?

Not that we know of. CVE-2026-29004 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.38% is the estimated probability that it will be exploited in the next 30 days. That is higher than 31% of all scored CVEs.

How severe is CVE-2026-29004?

CVE-2026-29004 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-29004 affect?

Published advisories record a fix for busybox (Red Hat / RHEL), busybox (Rocky). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.