Numeric Truncation Error in ISC BIND - CVE-2026-19667
Published: September 16, 2026
Vulnerability identifier: #VU150224
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-19667
CWE-ID: CWE-197
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to numeric truncation in dns_ncache_add() when processing a negative answer exactly 65536 bytes long from an attacker-controlled authoritative server. A remote attacker can return such a negative answer to cause a denial of service.
Affected software
ISC BIND
Debian Linux
bind9 (Debian package)
Debian Linux
bind9 (Debian package)
How to mitigate CVE-2026-19667
Install security update from vendor's website.
ISC BIND - addressed in versions 9.20.29, 9.20.29-s1, 9.21.26
bind9 (Debian package) - update to 1:9.20.29-1~deb13u1
bind9 (Debian package) - update to 1:9.20.29-1~deb13u1