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ID","text":"2535435"}],"notes":[{"category":"description","text":"A flaw was found in `bind9`'s `named` component. A remote attacker, by sending a specially crafted DNS negative answer of exactly 65536 bytes from an authoritative server, can cause a 16-bit length truncation. This results in a zero-byte negative cache entry. When `named` attempts to read this invalid entry, it will unexpectedly terminate, leading to a Denial of Service (DoS).","title":"Vulnerability description"},{"category":"summary","text":"bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling","title":"Vulnerability summary"},{"category":"other","text":"This is an Important denial of service flaw in BIND 9's `named` service. An attacker-controlled authoritative server can trigger a `named` abort by sending a precisely sized negative DNS answer. This vulnerability primarily affects BIND instances configured as recursive resolvers that query untrusted authoritative servers, leading to service disruption.","title":"Statement"},{"category":"general","text":"The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.","title":"CVSS score 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URL","url":"https://access.redhat.com/security/cve/CVE-2026-19667"},{"category":"external","summary":"RHBZ#2535435","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535435"},{"category":"external","summary":"https://www.cve.org/CVERecord?id=CVE-2026-19667","url":"https://www.cve.org/CVERecord?id=CVE-2026-19667"},{"category":"external","summary":"https://nvd.nist.gov/vuln/detail/CVE-2026-19667","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19667"},{"category":"external","summary":"https://downloads.isc.org/isc/bind9/9.20.29","url":"https://downloads.isc.org/isc/bind9/9.20.29"},{"category":"external","summary":"https://downloads.isc.org/isc/bind9/9.21.26","url":"https://downloads.isc.org/isc/bind9/9.21.26"},{"category":"external","summary":"https://kb.isc.org/docs/cve-2026-19667","url":"https://kb.isc.org/docs/cve-2026-19667"}],"release_date":"2026-09-16T13:46:56.783000+00:00","remediations":[{"category":"workaround","details":"To reduce the exposure to this vulnerability, configure BIND 9 to forward all DNS queries to trusted, non-vulnerable upstream DNS servers. This prevents the local `named` instance from directly interacting with potentially malicious authoritative servers.\n\nExample configuration in `named.conf`:\n```\noptions {\n    forwarders { 192.0.2.1; 192.0.2.2; };\n    forward only;\n};\n```\nReplace `192.0.2.1` and `192.0.2.2` with the IP addresses of your trusted upstream DNS servers. After modifying the configuration, restart the `named` service for the changes to take effect. This configuration may impact DNS resolution if the configured forwarders are unavailable or do not provide comprehensive 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bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling"}]}