PT-2026-63417 · Isc · Bind 9

CVE-2026-11721 · Publicado 2026-07-22 · Atualizado 2026-07-22

Mitre

CVSS v3.1

7.5

Alta

Vetor base

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set synth-from-dnssec yes; (which is the default). This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Correção

Enumeração de Fraquezas

CWE-1284

Identificadores relacionados

CVE-2026-11721

Produtos afetados

Bind 9

Referências · 4

• https://kb.isc.org/docs/cve-2026-11721 · Aviso do Fabricante
• https://downloads.isc.org/isc/bind9/9.21.24 · Correção
• https://nvd.nist.gov/vuln/detail/CVE-2026-11721 · Nota de Segurança
• https://downloads.isc.org/isc/bind9/9.20.26 · Correção