Bug 2535477 (CVE-2026-19666) - CVE-2026-19666 bind: BIND: Denial of Service via malformed DNS64 responses
Summary: CVE-2026-19666 bind: BIND: Denial of Service via malformed DNS64 responses
Keywords:
Status: NEW
Alias: CVE-2026-19666
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: 2535866
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-16 14:35 UTC by OSIDB Bzimport
Modified: 2026-09-17 08:49 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Last Closed:
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Description OSIDB Bzimport 2026-09-16 14:35:36 UTC 
On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly.
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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