CVE-2026-19667

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.

Score

CVSS 3.1 7.5 High

Status

Awaiting Analysis - security-officer@isc.org

Published

2026-09-16

Last modified

2026-10-26

Weaknesses

CWE-197

Affected products

• Bind (Isc)

References

• https://kb.isc.org/docs/cve-2026-19667
• https://downloads.isc.org/isc/bind9/9.20.29
• https://downloads.isc.org/isc/bind9/9.21.26