Remotely triggerable out-of-bounds heap write in dhclient

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Summary

CVECVE-2026-42512
StatePUBLISHED
Assignerfreebsd
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-30 09:16:03 UTC
Updated2026-04-30 09:16:03 UTC
DescriptionAs dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer overrun. A specially crafted packet can cause dhclient to overrun its buffer of environment entries. This can result in a crash, but it may be possible to leverage this bug to achieve remote code execution.

Risk And Classification

Problem Types: CWE-122 | CWE-122 CWE-122: Heap-based Buffer Overflow

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FreeBSD FreeBSD affected 15.0-RELEASE p7 release Not specified
CNA FreeBSD FreeBSD affected 14.4-RELEASE p3 release Not specified
CNA FreeBSD FreeBSD affected 14.3-RELEASE p12 release Not specified
CNA FreeBSD FreeBSD affected 13.5-RELEASE p13 release Not specified

References

ReferenceSourceLinkTags
security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc [email protected] security.freebsd.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Joshua Rogers of AISLE Research Team (en)

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