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CVE-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 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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:afd657eae7a1f6f8da9bbb3f2dd749d922d586d3e970106f978a8b1941e53707
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unknown","modules":["dhclient"],"product":"FreeBSD","vendor":"FreeBSD","versions":[{"lessThan":"p7","status":"affected","version":"15.0-RELEASE","versionType":"release"},{"lessThan":"p3","status":"affected","version":"14.4-RELEASE","versionType":"release"},{"lessThan":"p12","status":"affected","version":"14.3-RELEASE","versionType":"release"},{"lessThan":"p13","status":"affected","version":"13.5-RELEASE","versionType":"release"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:19303fc45c2d52a6fa6c57c183186bc69f0e29f6e211222e91b6290a019c5823 · sha256:fca0a97a939e7297… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:19303fc45c2d52a6fa6c57c183186bc69f0e29f6e211222e91b6290a019c5823 · sha256:fca0a97a939e7297… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:19303fc45c2d52a6fa6c57c183186bc69f0e29f6e211222e91b6290a019c5823 · sha256:fca0a97a939e7297… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"tags":["vendor-advisory"],"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:19303fc45c2d52a6fa6c57c183186bc69f0e29f6e211222e91b6290a019c5823 · sha256:fca0a97a939e7297… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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