CVE-2026-29004

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 30.6% of scored records. A rank, not a probability.

NVD base score

7.2 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS 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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-07-15.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-05-04 18:05Z4 MO AGO

Last updated

2026-07-15 01:10Z1 MO AGO

Reserved

2026-03-03

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 7.2)

CNA CVSS 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

Weaknesses

• CWE-122Heap-based Buffer OverflowVariant
• CWE-131Incorrect Calculation of Buffer SizeBase

Data version

5.2

Document digest

970d7a488c51f75e5ed9bfaf32260533dcca4383e59333919db6fe99ce43253c

• y637f9qq2x.comhttps://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/technical-descriptionexploit
• github.comhttps://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2apatch
• github.comhttps://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409patch
• busybox.nethttps://busybox.net/product
• www.vulncheck.comhttps://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-serversthird-party-advisory
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-29004vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2466526https://bugzilla.redhat.com/show_bug.cgi?id=2466526issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29004.jsonx_sadp-csaf-vex
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:30652vendor-advisoryx_refsource_REDHAT