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CVE-2026-5947

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

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

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 · Élevée · EPSS 1,4% · Correctif disponible

Publication
Mise à jour

Pile logicielle: system

Produits et versions concernés

  • bind 9

    Versions du logiciel
    • ≥ 9.20.0, ≤ 9.20.22: Concernée (custom)
    • ≥ 9.21.0, ≤ 9.21.21: Concernée (custom)
    • ≥ 9.20.9-S1, ≤ 9.20.22-S1: Concernée (custom)
    • ≥ 9.18.28, ≤ 9.18.49: Non concernée (custom)
    • ≥ 9.18.28-S1, ≤ 9.18.49-S1: Non concernée (custom)

    Aucun correctif publié

  • bind9 Debian:13

    Versions du logiciel
    • 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
    Plages de versions concernées
    • ECOSYSTEM: < 1:9.20.23-1~deb13u1

    Mettez à jour vers 1:9.20.23-1~deb13u1

  • bind9 Debian:14

    Versions du logiciel
    • 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
    Plages de versions concernées
    • ECOSYSTEM: < 1:9.20.23-1

    Mettez à jour vers 1:9.20.23-1

  • bind9 Ubuntu:25.10

    Versions du logiciel
    • 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
    Plages de versions concernées
    • ECOSYSTEM: < 1:9.20.11-1ubuntu2.4

    Mettez à jour vers 1:9.20.11-1ubuntu2.4

  • bind9 Ubuntu:26.04:LTS

    Versions du logiciel
    • 1:9.20.11-1ubuntu2
    • 1:9.20.11-1ubuntu3
    • 1:9.20.18-1ubuntu1
    • 1:9.20.18-1ubuntu2
    Plages de versions concernées
    • ECOSYSTEM: < 1:9.20.18-1ubuntu2.1

    Mettez à jour vers 1:9.20.18-1ubuntu2.1

Sources originales

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