{"dataType":"CVE_RECORD","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":"2026-03-23T15:13:56.930Z"},"containers":{"cna":{"providerMetadata":{"orgId":"3ff69d7a-14f2-4f67-a097-88dee7810d18","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":[{"lang":"en","cweId":"CWE-125","description":"CWE-125 Out-of-bounds read","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-142","descriptions":[{"lang":"en","value":"CAPEC-142 DNS Cache Poisoning"}]}],"affected":[{"vendor":"The GNU C Library","product":"glibc","versions":[{"status":"affected","version":"2.34","lessThanOrEqual":"2.43","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<div>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.<br></div>"}]}],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34014"}],"credits":[{"lang":"en","value":"Antonio Maini (0rbitingZer0) - 0rbitingZer0@proton.me","type":"finder"},{"lang":"en","value":"Kevin Farrell","type":"reporter"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"metrics":[{"cvssV3_1":{"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"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-03-23T15:10:34.650805Z","id":"CVE-2026-4437","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-23T15:13:56.930Z"}}]}}