CVE-2026-42512

{"id": "CVE-2026-42512", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42512", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-05-01T03:55:53.107126Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}]}, "affected": [{"source": "secteam@freebsd.org", "affectedData": [{"vendor": "FreeBSD", "modules": ["dhclient"], "product": "FreeBSD", "versions": [{"status": "affected", "version": "15.0-RELEASE", "lessThan": "p7", "versionType": "release"}, {"status": "affected", "version": "14.4-RELEASE", "lessThan": "p3", "versionType": "release"}, {"status": "affected", "version": "14.3-RELEASE", "lessThan": "p12", "versionType": "release"}, {"status": "affected", "version": "13.5-RELEASE", "lessThan": "p13", "versionType": "release"}], "defaultStatus": "unknown"}]}], "published": "2026-04-30T09:16:03.373", "references": [{"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc", "tags": ["Vendor Advisory"], "source": "secteam@freebsd.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "secteam@freebsd.org", "description": [{"lang": "en", "value": "CWE-122"}]}], "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."}], "lastModified": "2026-06-17T10:47:57.860", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:freebsd:freebsd:13.5:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "947F561E-AD65-43B9-94C1-3109A3D35248"}, {"criteria": "cpe:2.3:o:freebsd:freebsd:13.5:beta3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4216D505-95A5-4FCC-8B9A-26FCD32B0445"}, {"criteria": "cpe:2.3:o:freebsd:freebsd:13.5:p1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3D1987F1-1E08-4B28-8D16-D25A091D99ED"}, {"criteria": "cpe:2.3:o:freebsd:freebsd:13.5:p10:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4C859EE2-59C0-4234-BFF0-7794AC4956DD"}, {"criteria": "cpe:2.3:o:freebsd:freebsd:13.5:p11:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D1CEB391-5FA3-4FFD-9279-113093DD500D"}, {"criteria": "cpe:2.3:o:freebsd:freebsd:13.5:p12:*:*:*:*:*:*", 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