Bug 2504166 (CVE-2026-13321) - CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
Summary: CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Nex...
Keywords:
Status: NEW
Alias: CVE-2026-13321
Deadline: 2026-07-22
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-21 19:47 UTC by OSIDB Bzimport
Modified: 2026-07-22 15:39 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-07-21 19:47:52 UTC 
The resolver accepts validly-signed NSEC records where the "Next
  Domain Name" field points outside the signer's zone. An attacker
  controlling ANY DNSSEC-signed zone can craft NSEC records spanning
  into victim zones, enabling cross-zone cache poisoning with AD=1
  (Authenticated Data flag set)
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