{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89092","assignerOrgId":"3ff69d7a-14f2-4f67-a097-88dee7810d18","state":"PUBLISHED","assignerShortName":"glibc","dateReserved":"2026-09-10T20:18:09.584Z","datePublished":"2026-09-11T01:23:01.162Z","dateUpdated":"2026-09-11T17:02:18.288Z"},"containers":{"cna":{"providerMetadata":{"orgId":"3ff69d7a-14f2-4f67-a097-88dee7810d18","shortName":"glibc","dateUpdated":"2026-09-11T01:23:01.162Z"},"title":"Stack overflow in nscd due to unbounded alloca use","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-789","description":"CWE-789 Memory allocation with excessive size value","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":"2.3.4","lessThan":"2.45","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"The nscd service in the GNU C Library 2.3.4 onwards may crash due to a \nstack overflow when a malicious DNS server returns too large a response \nfor a DNS query, resulting in degraded DNS resolution for the system.\n\n\n\nExploitation of this bug needs a system that has nscd enabled and using \nan untrusted DNS server for name resolution, with the compromised DNS \nserver being capable of processing records large enough to result in a \nstack overflow in an nscd thread stack.  During experimentation, bind 9 \nwas unable to handle large records, but that could change in future or \nwith a different name server.  In typical installations, nscd is \nexecuted in an isolated context as its own user without a shell, due to \nwhich any compromise of that service is isolated.\n\n\n\nThere is a remote possibility of nscd cache corruption if an attacker \nmanages to get the stack pointer into a desired point in the heap, \npotentially resulting in other caches in nscd being overwritten with \ncorrupt data through the stack overflow, until the buggy code path \neventually results in a crash.\n\n\n\nFinally, a crash in nscd may result in performance degradation when \nresolving names, but it does not result in a denial of service.","supportingMedia":[{"type":"text/html","base64":false,"value":"The nscd service in the GNU C Library 2.3.4 onwards may crash due to a \nstack overflow when a malicious DNS server returns too large a response \nfor a DNS query, resulting in degraded DNS resolution for the system.\n<br>\n<br>Exploitation of this bug needs a system that has nscd enabled and using \nan untrusted DNS server for name resolution, with the compromised DNS \nserver being capable of processing records large enough to result in a \nstack overflow in an nscd thread stack.&nbsp; During experimentation, bind 9 \nwas unable to handle large records, but that could change in future or \nwith a different name server.&nbsp; In typical installations, nscd is \nexecuted in an isolated context as its own user without a shell, due to \nwhich any compromise of that service is isolated.\n<br>\n<br>There is a remote possibility of nscd cache corruption if an attacker \nmanages to get the stack pointer into a desired point in the heap, \npotentially resulting in other caches in nscd being overwritten with \ncorrupt data through the stack overflow, until the buggy code path \neventually results in a crash.\n<br>\n<br>Finally, a crash in nscd may result in performance degradation when \nresolving names, but it does not result in a denial of service.&nbsp;"}]}],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34624","tags":["issue-tracking"]},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0016","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"LOW","baseSeverity":"MEDIUM","baseScore":4.2,"vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L"}}],"credits":[{"lang":"en","value":"Anmol Singh Rajput","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/09/11/2"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-09-11T03:09:09.108Z"}},{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-11T16:57:22.665457Z","id":"CVE-2026-89092","options":[{"Exploitation":"none"},{"Automatable":"no"},{"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":"2026-09-11T17:02:18.288Z"}}]}}