As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Apr 30, 2026 · NIST NVD

   Detected

   As 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 levera

2. Jun 17, 2026 · NIST NVD

   Updated

   As 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 levera

Affected

• cpe freebsd/freebsd13.5

Sources

• CVE.orgVulnerability recordCVE-2026-42512

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-42512

  As 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

  nvd.nist.gov

References

• Vendor Advisory · security.freebsd.org