{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42512", "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "state": "PUBLISHED", "assignerShortName": "freebsd", "dateReserved": "2026-04-28T05:31:44.956Z", "datePublished": "2026-04-30T07:58:37.145Z", "dateUpdated": "2026-04-30T07:58:37.145Z"}, "containers": {"cna": {"datePublic": "2026-04-29T19:00:00.000Z", "title": "Remotely triggerable out-of-bounds heap write in dhclient", "references": [{"tags": ["vendor-advisory"], "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc"}], "affected": [{"defaultStatus": "unknown", "modules": ["dhclient"], "product": "FreeBSD", "vendor": "FreeBSD", "versions": [{"status": "affected", "versionType": "release", "version": "15.0-RELEASE", "lessThan": "p7"}, {"status": "affected", "versionType": "release", "version": "14.4-RELEASE", "lessThan": "p3"}, {"status": "affected", "versionType": "release", "version": "14.3-RELEASE", "lessThan": "p12"}, {"status": "affected", "versionType": "release", "version": "13.5-RELEASE", "lessThan": "p13"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Joshua Rogers of AISLE Research Team"}], "descriptions": [{"lang": "en", "value": "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.\n\nA 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."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-122", "description": "CWE-122: Heap-based Buffer Overflow", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "shortName": "freebsd", "dateUpdated": "2026-04-30T07:58:37.145Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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.\n\nA 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."}], "id": "CVE-2026-42512", "lastModified": "2026-04-30T09:16:03.373", "metrics": {}, "published": "2026-04-30T09:16:03.373", "references": [{"source": "secteam@freebsd.org", "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc"}], "sourceIdentifier": "secteam@freebsd.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "secteam@freebsd.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[15.0-RELEASE,p7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[14.4-RELEASE,p3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[14.3-RELEASE,p12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[13.5-RELEASE,p13)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "FreeBSD", "source": "cna", "vendor": "FreeBSD"}, "product": "freebsd", "vendor": "freebsd"}], "created": "2026-04-30T11:30:05.888699+00:00", "updated": "2026-04-30T11:30:05.888843+00:00", "vendors": ["freebsd", "freebsd$PRODUCT$freebsd"]}