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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-4437",
        "assignerOrgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
        "state": "PUBLISHED",
        "assignerShortName": "glibc",
        "dateReserved": "2026-03-19T19:55:42.906Z",
        "datePublished": "2026-03-20T19:59:00.427Z",
        "dateUpdated": "2026-10-15T01:12:09.122Z"
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                "shortName": "glibc",
                "dateUpdated": "2026-03-20T19:59:00.427Z"
            },
            "title": "gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response",
            "datePublic": "2026-03-20T22:20:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
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                            "lang": "en",
                            "cweId": "CWE-125",
                            "description": "CWE-125 Out-of-bounds read",
                            "type": "CWE"
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            "impacts": [
                {
                    "capecId": "CAPEC-142",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-142 DNS Cache Poisoning"
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                    "vendor": "The GNU C Library",
                    "product": "glibc",
                    "versions": [
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                            "version": "2.34",
                            "lessThanOrEqual": "2.43",
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                    "lang": "en",
                    "value": "Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C Library version 2.34 to version 2.43 could, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.",
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            "references": [
                {
                    "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=34014"
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            "credits": [
                {
                    "lang": "en",
                    "value": "Antonio Maini (0rbitingZer0) - 0rbitingZer0@proton.me",
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                {
                    "lang": "en",
                    "value": "Kevin Farrell",
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                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 7.5,
                            "attackVector": "NETWORK",
                            "baseSeverity": "HIGH",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                            "integrityImpact": "NONE",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "NONE"
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                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-23T15:10:34.650805Z",
                                "id": "CVE-2026-4437",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
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                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
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                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
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                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-03-23T15:13:56.930Z"
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            },
            {
                "x_adpType": "supplier",
                "providerMetadata": {
                    "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
                    "shortName": "siemens-SADP",
                    "dateUpdated": "2026-10-15T01:12:09.122Z"
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                "affected": [
                    {
                        "vendor": "Siemens",
                        "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
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                                "status": "affected",
                                "version": "V3.1.5",
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                                "versionType": "custom"
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                "references": [
                    {
                        "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
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