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CVE-2026-5947

CVE-2026-5947 · SIG(0) validation during query flood may lead to undefined behavior

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation may attempt to read the now-discarded DNS message. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.

CVSS 7.5 · Alta · EPSS 1,4% · Corrección disponible

Publicación
Actualización

Pila tecnológica: system

Productos y versiones afectados

  • bind 9

    Versiones
    • ≥ 9.20.0, ≤ 9.20.22: Afectada (custom)
    • ≥ 9.21.0, ≤ 9.21.21: Afectada (custom)
    • ≥ 9.20.9-S1, ≤ 9.20.22-S1: Afectada (custom)
    • ≥ 9.18.28, ≤ 9.18.49: No afectada (custom)
    • ≥ 9.18.28-S1, ≤ 9.18.49-S1: No afectada (custom)

    Sin corrección publicada

  • bind9 Debian:13

    Versiones
    • 1:9.20.11-4
    • 1:9.20.15-1
    • 1:9.20.15-1~deb13u1
    • 1:9.20.15-1~deb13u1~bpo12+1
    • 1:9.20.15-2
    • 1:9.20.18-1
    • 1:9.20.18-1~deb13u1
    • 1:9.20.18-1~deb13u1~bpo12+1
    • 1:9.20.19-1
    • 1:9.20.19-1~bpo12+1
    • 1:9.20.20-1
    • 1:9.20.20-1~bpo12+1
    • 1:9.20.21-1
    • 1:9.20.21-1~deb13u1
    • 1:9.20.21-1~deb13u1~bpo12+1
    • 1:9.20.22-1
    • 1:9.20.23-1~deb13u1~bpo12+1
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1:9.20.23-1~deb13u1

    Actualiza a 1:9.20.23-1~deb13u1

  • bind9 Debian:14

    Versiones
    • 1:9.20.11-4
    • 1:9.20.15-1
    • 1:9.20.15-1~deb13u1
    • 1:9.20.15-1~deb13u1~bpo12+1
    • 1:9.20.15-2
    • 1:9.20.18-1
    • 1:9.20.18-1~deb13u1
    • 1:9.20.18-1~deb13u1~bpo12+1
    • 1:9.20.19-1
    • 1:9.20.19-1~bpo12+1
    • 1:9.20.20-1
    • 1:9.20.20-1~bpo12+1
    • 1:9.20.21-1
    • 1:9.20.21-1~deb13u1
    • 1:9.20.21-1~deb13u1~bpo12+1
    • 1:9.20.22-1
    • 1:9.20.23-1~deb13u1
    • 1:9.20.23-1~deb13u1~bpo12+1
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1:9.20.23-1

    Actualiza a 1:9.20.23-1

  • bind9 Ubuntu:25.10

    Versiones
    • 1:9.20.4-3ubuntu1
    • 1:9.20.4-3ubuntu2
    • 1:9.20.4-3ubuntu3
    • 1:9.20.9-2ubuntu1
    • 1:9.20.10-1ubuntu1
    • 1:9.20.11-1ubuntu1
    • 1:9.20.11-1ubuntu2
    • 1:9.20.11-1ubuntu2.1
    • 1:9.20.11-1ubuntu2.2
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1:9.20.11-1ubuntu2.4

    Actualiza a 1:9.20.11-1ubuntu2.4

  • bind9 Ubuntu:26.04:LTS

    Versiones
    • 1:9.20.11-1ubuntu2
    • 1:9.20.11-1ubuntu3
    • 1:9.20.18-1ubuntu1
    • 1:9.20.18-1ubuntu2
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1:9.20.18-1ubuntu2.1

    Actualiza a 1:9.20.18-1ubuntu2.1

Fuentes originales

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