Bug 2535435 (CVE-2026-19667) - CVE-2026-19667 bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling
Summary: CVE-2026-19667 bind9: bind: BIND 9: Denial of Service via 16-bit length trunc...
Keywords:
Status: NEW
Alias: CVE-2026-19667
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2535867
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-16 13:59 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 13:59:17 UTC 
If an attacker-controlled authoritative server can produce a negative answer that is exactly 65536 bytes, then a flaw in `named` results in a negative cache entry of 0 bytes. When this entry is subsequently read, `named` aborts.
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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