CVE-2026-76163

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{"bugzilla": {"description": "bind: BIND: Denial of Service via TKEY query with specific configuration", "id": "2535467", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535467"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending a specially crafted TKEY query to a BIND server configured without a global 'options' block in its 'named.conf' file. This can lead to an assertion failure, causing the BIND program to unexpectedly terminate. This results in a Denial of Service (DoS), making the affected server unavailable."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution."}, "name": "CVE-2026-76163", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "bind9.16", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "bind9.18", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-16T14:05:34Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-76163\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-76163\nhttps://downloads.isc.org/isc/bind9/9.20.29\nhttps://downloads.isc.org/isc/bind9/9.21.26\nhttps://kb.isc.org/docs/cve-2026-76163"], "statement": "This is an Important denial of service flaw in BIND. If the `named.conf` file lacks a global `options` block, a remote attacker can send a crafted TKEY query, leading to an assertion failure and unexpected program termination. This issue impacts the availability of the DNS service.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.0,9.20.27]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.21.0,9.21.25]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.9-S1,9.20.27-S1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "BIND 9", "source": "cna", "vendor": "ISC"}, "product": "bind_9", "vendor": "isc"}], "created": "2026-09-17T04:45:16.975997+00:00", "updated": "2026-09-18T02:45:17.173547+00:00", "vendors": ["isc", "isc$PRODUCT$bind_9"]}