Bug 2535867 - CVE-2026-19667 bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling [fedora-all]
Summary: CVE-2026-19667 bind: BIND 9: Denial of Service via 16-bit length truncation i...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: bind
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Petr Menšík
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["5cb306ea-b4ff-420e-95ae-2...
Depends On:
Blocks: CVE-2026-19667
TreeView+ depends on / blocked
 
Reported: 2026-09-17 08:49 UTC by Vladimir Vasilev
Modified: 2026-09-17 08:49 UTC (History)
5 users (show)

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

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Description Vladimir Vasilev 2026-09-17 08:49:45 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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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