{"id":"CVE-2026-1519","title":"If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU","summary":"If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritati…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-606","CWE-770"],"vendor":"isc","product":"bind","affected":["bind >= 9.11.0, <= 9.16.50","bind >= 9.18.0, < 9.18.47","bind >= 9.20.0, < 9.20.21","bind >= 9.21.0, < 9.21.20"],"patched":["bind 9.21.20"],"published":"2026-03-25","updated":"2026-09-17","sourceUpdated":"2026-09-17T12:17:24.763","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-1519","references":[{"url":"https://downloads.isc.org/isc/bind9/9.18.47","label":"security-officer@isc.org"},{"url":"https://downloads.isc.org/isc/bind9/9.20.21","label":"security-officer@isc.org"},{"url":"https://downloads.isc.org/isc/bind9/9.21.20","label":"security-officer@isc.org"},{"url":"https://kb.isc.org/docs/cve-2026-1519","label":"security-officer@isc.org"},{"url":"https://lists.debian.org/debian-lts-announce/2026/04/msg00008.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2026:11371","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:11372","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:15890","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16060","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16064","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:24500","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:24851","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:24934","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25083","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25171","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25214","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:29110","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:29863","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34048","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36610","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:40021","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:43226","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:60019","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:62549","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:65851","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6935","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:7915","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:8075","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:8155","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:8312","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:8352","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-1519","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451305","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1519.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-1519"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1519"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-25T14:55:33.427270Z"},"epss":0.01599,"epssPercentile":0.74285,"ingestedAt":"2026-07-03T14:03:36.906Z","slug":"CVE-2026-1519","body":"## Overview\n\nIf a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. 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.\n\n## Affected\n\n- `bind >= 9.11.0, <= 9.16.50`\n- `bind >= 9.18.0, < 9.18.47`\n- `bind >= 9.20.0, < 9.20.21`\n- `bind >= 9.21.0, < 9.21.20`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `bind 9.21.20`\n\n## Vendor advisories\n\n- **RHSA-2026:11372** · Red Hat · fixed in: Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION), Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) · released 2026-04-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:11372)\n- **RHSA-2026:11371** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-04-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:11371)\n- **RHSA-2026:34048** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:34048)\n- **RHSA-2026:40021** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.13 · released 2026-07-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:40021)\n- **RHSA-2026:36610** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:36610)\n- **RHSA-2026:43226** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.15 · released 2026-07-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:43226)\n- **RHSA-2026:62549** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:62549)\n- **RHSA-2026:60019** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:60019)\n- **RHSA-2026:29863** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-07-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:29863)\n- **RHSA-2026:24851** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-06-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:24851)\n- **RHSA-2026:8312** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-04-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:8312)\n- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1519.json)\n- **RHSA-2026:65851** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:65851)","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}