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CVE-2026-42959

CVE-2026-42959 · Crash during DNSSEC validation of malicious content

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

NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.

CVSS 8.7 · Alta · EPSS 0,8% · Corrección disponible

Publicación
Actualización

Pila tecnológica: system

Productos y versiones afectados

  • unbound

    Versiones
    • ≥ 0, < 1.25.1: Afectada (semver)

    Actualiza a 1.25.1

  • unbound Debian:12

    Versiones
    • 1.17.1-2
    • 1.17.1-2+deb12u1
    • 1.17.1-2+deb12u2
    • 1.17.1-2+deb12u3
    • 1.17.1-2+deb12u4
    • 1.17.1-2+loong64
    • 1.18.0-1
    • 1.18.0-2
    • 1.19.1-1
    • 1.19.2-1
    • 1.20.0-1
    • 1.21.1-1
    • 1.22.0-1
    • 1.22.0-2
    • 1.23.1-1
    • 1.24.0-1
    • 1.24.0-2
    • 1.24.1-1
    • 1.24.1-2
    • 1.24.2-1
    • 1.25.0-1
    • 1.25.1-1
    • 1.25.2-1
    • 1.26.0-1
    • 1.26.0-2
    • 1.26.1-1
    Intervalos de versiones afectados
    • ECOSYSTEM: (−∞, +∞)

    Sin corrección publicada

  • unbound Debian:13

    Versiones
    • 1.22.0-2
    • 1.22.0-2+deb13u1
    • 1.22.0-2+deb13u2
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.22.0-2+deb13u3

    Actualiza a 1.22.0-2+deb13u3

  • unbound Debian:14

    Versiones
    • 1.22.0-2
    • 1.23.1-1
    • 1.24.0-1
    • 1.24.0-2
    • 1.24.1-1
    • 1.24.1-2
    • 1.24.2-1
    • 1.25.0-1
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.25.1-1

    Actualiza a 1.25.1-1

  • unbound Ubuntu:Pro:14.04:LTS

    Versiones
    • 1.4.20-1
    • 1.4.21-1
    • 1.4.21-1ubuntu1
    • 1.4.21-1ubuntu2
    • 1.4.22-1ubuntu1
    • 1.4.22-1ubuntu2
    • 1.4.22-1ubuntu3
    • 1.4.22-1ubuntu4
    • 1.4.22-1ubuntu4.14.04.1
    • 1.4.22-1ubuntu4.14.04.2
    • 1.4.22-1ubuntu4.14.04.3
    • 1.4.22-1ubuntu4.14.04.3+esm1
    • 1.4.22-1ubuntu4.14.04.3+esm2
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.4.22-1ubuntu4.14.04.3+esm3

    Actualiza a 1.4.22-1ubuntu4.14.04.3+esm3

  • unbound Ubuntu:Pro:16.04:LTS

    Versiones
    • 1.4.22-1ubuntu6
    • 1.5.7-1ubuntu1
    • 1.5.7-1ubuntu2
    • 1.5.8-1ubuntu1
    • 1.5.8-1ubuntu1.1
    • 1.5.8-1ubuntu1.1+esm1
    • 1.5.8-1ubuntu1.1+esm2
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.5.8-1ubuntu1.1+esm3

    Actualiza a 1.5.8-1ubuntu1.1+esm3

  • unbound Ubuntu:Pro:18.04:LTS

    Versiones
    • 1.6.5-1
    • 1.6.7-1
    • 1.6.7-1build1
    • 1.6.7-1ubuntu1
    • 1.6.7-1ubuntu2
    • 1.6.7-1ubuntu2.1
    • 1.6.7-1ubuntu2.2
    • 1.6.7-1ubuntu2.3
    • 1.6.7-1ubuntu2.4
    • 1.6.7-1ubuntu2.5
    • 1.6.7-1ubuntu2.6
    • 1.6.7-1ubuntu2.6+esm2
    • 1.6.7-1ubuntu2.6+esm3
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.6.7-1ubuntu2.6+esm4

    Actualiza a 1.6.7-1ubuntu2.6+esm4

  • unbound Ubuntu:Pro:20.04:LTS

    Versiones
    • 1.9.0-2ubuntu1
    • 1.9.0-2ubuntu2
    • 1.9.4-2
    • 1.9.4-2ubuntu1
    • 1.9.4-2ubuntu1.1
    • 1.9.4-2ubuntu1.2
    • 1.9.4-2ubuntu1.3
    • 1.9.4-2ubuntu1.4
    • 1.9.4-2ubuntu1.5
    • 1.9.4-2ubuntu1.6
    • 1.9.4-2ubuntu1.8
    • 1.9.4-2ubuntu1.9
    • 1.9.4-2ubuntu1.11
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.9.4-2ubuntu1.11+esm1

    Actualiza a 1.9.4-2ubuntu1.11+esm1

  • unbound Ubuntu:22.04:LTS

    Versiones
    • 1.13.1-1ubuntu1
    • 1.13.1-1ubuntu3
    • 1.13.1-1ubuntu5
    • 1.13.1-1ubuntu5.1
    • 1.13.1-1ubuntu5.2
    • 1.13.1-1ubuntu5.3
    • 1.13.1-1ubuntu5.4
    • 1.13.1-1ubuntu5.5
    • 1.13.1-1ubuntu5.7
    • 1.13.1-1ubuntu5.8
    • 1.13.1-1ubuntu5.10
    • 1.13.1-1ubuntu5.11
    • 1.13.1-1ubuntu5.12
    • 1.13.1-1ubuntu5.13
    • 1.13.1-1ubuntu5.14
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.13.1-1ubuntu5.15

    Actualiza a 1.13.1-1ubuntu5.15

  • unbound Ubuntu:24.04:LTS

    Versiones
    • 1.17.1-2
    • 1.18.0-2ubuntu1
    • 1.18.0-2ubuntu2
    • 1.19.1-1ubuntu1
    • 1.19.2-1ubuntu1
    • 1.19.2-1ubuntu3
    • 1.19.2-1ubuntu3.1
    • 1.19.2-1ubuntu3.2
    • 1.19.2-1ubuntu3.3
    • 1.19.2-1ubuntu3.4
    • 1.19.2-1ubuntu3.5
    • 1.19.2-1ubuntu3.6
    • 1.19.2-1ubuntu3.7
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.19.2-1ubuntu3.8

    Actualiza a 1.19.2-1ubuntu3.8

  • unbound Ubuntu:25.10

    Versiones
    • 1.22.0-1ubuntu1
    • 1.22.0-2ubuntu1
    • 1.22.0-2ubuntu2
    • 1.22.0-2ubuntu2.1
    • 1.22.0-2ubuntu2.2
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.22.0-2ubuntu2.3

    Actualiza a 1.22.0-2ubuntu2.3

  • unbound Ubuntu:26.04:LTS

    Versiones
    • 1.22.0-2ubuntu2
    • 1.22.0-2ubuntu4
    • 1.24.2-1ubuntu1
    • 1.24.2-1ubuntu2
    Intervalos de versiones afectados
    • ECOSYSTEM: < 1.24.2-1ubuntu2.1

    Actualiza a 1.24.2-1ubuntu2.1

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