{"id":"CVE-2026-4438","revision":"e71ec576f0ef4ab092ea0cd570f5ea0f","records":[{"revision":"e71ec576f0ef4ab092ea0cd570f5ea0f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-4438","aliases":[],"title":"gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames","description":"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 result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.","state":0,"publishedAt":"2026-03-20T19:59:06.064+00:00","modifiedAt":"2026-10-15T01:12:10.681+00:00","affected":[{"ecosystem":"Vendor product","name":"glibc","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"The GNU C Library\",\n                    \"product\": \"glibc\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.34\",\n                            \"lessThanOrEqual\": \"2.43\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://sourceware.org/bugzilla/show_bug.cgi?id=34015"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-4438","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-4438","identifiers":["CVE-2026-4438"]},"retained":false,"historicalAffected":[]}],"coverage":[]}