CVE-2026-1519
Estado: ModificadaAlta (7.5)—
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 authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This 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.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.60%
- Percentil entre todas las CVEs puntuadas: 75
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access95 % - Impacto principal
T1499.004Application or System Exploitationimpact90 %
Vector CVSS AV:N/AC:L/PR:N permite explotación remota sin privilegios (T1190). El consumo excesivo de CPU en validación DNSSEC de zona malformada es DoS de aplicación (T1499.004); CWE-770 (asignación sin límites) lo confirma.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-606
- CWE-770
Referencias
- https://downloads.isc.org/isc/bind9/9.18.47
- https://downloads.isc.org/isc/bind9/9.20.21
- https://downloads.isc.org/isc/bind9/9.21.20
- https://kb.isc.org/docs/cve-2026-1519
- https://lists.debian.org/debian-lts-announce/2026/04/msg00008.html
- https://access.redhat.com/errata/RHSA-2026:11371
- https://access.redhat.com/errata/RHSA-2026:11372
- https://access.redhat.com/errata/RHSA-2026:15890
- https://access.redhat.com/errata/RHSA-2026:16060
- https://access.redhat.com/errata/RHSA-2026:16064
- https://access.redhat.com/errata/RHSA-2026:24500
- https://access.redhat.com/errata/RHSA-2026:24851
- https://access.redhat.com/errata/RHSA-2026:24934
- https://access.redhat.com/errata/RHSA-2026:25083
- https://access.redhat.com/errata/RHSA-2026:25171
- https://access.redhat.com/errata/RHSA-2026:25214
- https://access.redhat.com/errata/RHSA-2026:29110
- https://access.redhat.com/errata/RHSA-2026:29863
- https://access.redhat.com/errata/RHSA-2026:34048
- https://access.redhat.com/errata/RHSA-2026:36610
- https://access.redhat.com/errata/RHSA-2026:40021
- https://access.redhat.com/errata/RHSA-2026:43226
- https://access.redhat.com/errata/RHSA-2026:60019
- https://access.redhat.com/errata/RHSA-2026:62549
- https://access.redhat.com/errata/RHSA-2026:65851
- https://access.redhat.com/errata/RHSA-2026:6935
- https://access.redhat.com/errata/RHSA-2026:7915
- https://access.redhat.com/errata/RHSA-2026:8075
- https://access.redhat.com/errata/RHSA-2026:8155
- https://access.redhat.com/errata/RHSA-2026:8312
- https://access.redhat.com/errata/RHSA-2026:8352
- https://access.redhat.com/security/cve/CVE-2026-1519
- https://bugzilla.redhat.com/show_bug.cgi?id=2451305
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1519.json
JSON original (NVD)
Mostrar
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"value": "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 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."
},
{
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"value": "Si un resolvedor BIND está realizando validación DNSSEC y encuentra una zona creada maliciosamente, el resolvedor puede consumir CPU excesiva. Los servidores solo autoritativos generalmente no se ven afectados, aunque hay circunstancias en las que los servidores autoritativos pueden realizar consultas recursivas (ver: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries).\nEste problema afecta a las versiones de BIND 9 9.11.0 a 9.16.50, 9.18.0 a 9.18.46, 9.20.0 a 9.20.20, 9.21.0 a 9.21.19, 9.11.3-S1 a 9.16.50-S1, 9.18.11-S1 a 9.18.46-S1, y 9.20.9-S1 a 9.20.20-S1."
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