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NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets

CVSS 3.1 5.9 MEDIUMCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-77119

Published

A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

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CVE-2026-77119 · CVE overview and exploitation status

cve-program · CVE-2026-77119

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Sources read 13 Nov 07:12 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current