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Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries).\nThis issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1." } ], "impacts": [ { "descriptions": [ { "lang": "en", "value": "If this issue is encountered, the resolver may experience excessive CPU consumption and a sharp decrease in the number of queries per second that it can handle." } ] } ], "workarounds": [ { "lang": "en", "value": "This is not recommended, but disabling DNSSEC (`dnssec-validation no;`) prevents exploitation of this issue." } ], "exploits": [ { "lang": "en", "value": "We are not aware of any active exploits." } ], "solutions": [ { "lang": "en", "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.47, 9.20.21, 9.21.20, 9.18.47-S1, or 9.20.21-S1." } ], "credits": [ { "lang": "en", "value": "ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention." } ], "references": [ { "url": "https://kb.isc.org/docs/cve-2026-1519", "name": "CVE-2026-1519", "tags": [ "vendor-advisory" ] }, { "url": "https://downloads.isc.org/isc/bind9/9.18.47", "tags": [ "patch" ] }, { "url": "https://downloads.isc.org/isc/bind9/9.20.21", "tags": [ "patch" ] }, { "url": "https://downloads.isc.org/isc/bind9/9.21.20", "tags": [ "patch" ] } ], "source": { "discovery": "EXTERNAL" }, "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-03-25T14:55:33.427270Z", "id": "CVE-2026-1519", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } 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"x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:60019" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:29863" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:24851" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:8312" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:8352" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:8155" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:16064" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:16060" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:25171" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:15890" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:25083" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:29110" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:25214" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:24500" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:24934" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:8075" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:7915" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:6935" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:11372: Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION), Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION)" }, { "lang": "en", "value": "RHSA-2026:11371: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS)" }, { "lang": "en", "value": "RHSA-2026:34048: Red Hat OpenShift Container Platform 4.12" }, { "lang": "en", "value": "RHSA-2026:40021: Red Hat OpenShift Container Platform 4.13" }, { "lang": "en", "value": "RHSA-2026:36610: Red Hat OpenShift Container Platform 4.14" }, { "lang": "en", "value": "RHSA-2026:43226: Red Hat OpenShift Container Platform 4.15" }, { "lang": "en", "value": "RHSA-2026:60019: Red Hat OpenShift Container Platform 4.17" }, { "lang": "en", "value": "RHSA-2026:29863: Red Hat OpenShift Container Platform 4.19" }, { "lang": "en", "value": "RHSA-2026:24851: Red Hat Enterprise Linux AppStream EUS (v. 10.0)" }, { "lang": "en", "value": "RHSA-2026:8312: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)" }, { "lang": "en", "value": "RHSA-2026:8352: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8)" }, { "lang": "en", "value": "RHSA-2026:8155: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8)" }, { "lang": "en", "value": "RHSA-2026:16064: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4), Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)" }, { "lang": "en", "value": "RHSA-2026:16060: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6), Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS E4S (v.8.6), Red Hat Enterprise Linux BaseOS TUS (v.8.6)" }, { "lang": "en", "value": "RHSA-2026:25171: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)" }, { "lang": "en", "value": "RHSA-2026:15890: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8), Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)" }, { "lang": "en", "value": "RHSA-2026:25083: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)" }, { "lang": "en", "value": "RHSA-2026:29110: Red Hat Enterprise Linux AppStream E4S (v.9.2)" }, { "lang": "en", "value": "RHSA-2026:25214: Red Hat Enterprise Linux AppStream E4S (v.9.4)" }, { "lang": "en", "value": "RHSA-2026:24500: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:24934: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:8075: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:7915: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:6935: Red Hat Hardened Images" } ], "timeline": [ { "lang": "en", "time": "2026-03-25T14:01:56.586Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-03-25T13:25:19.802Z", "value": "Made public." } ], "title": "bind: BIND: Denial of Service via maliciously crafted DNSSEC-validated zone", "workarounds": [ { "lang": "en", "value": "To mitigate this issue, disable DNSSEC validation on affected BIND resolvers. Alternatively, configure the BIND server as authoritative-only if recursive queries are not required. Disabling DNSSEC validation may reduce the security posture of the DNS resolver. A restart of the BIND service (`named`) is required for these changes to take effect and may temporarily interrupt DNS resolution." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-04T12:04:45.426Z" } } ] } }