Use-after-free in ISC BIND - CVE-2026-19662

Vulnerability identifier: #VU150226

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-19662

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a use-after-free in qpcache NOQNAME proof handling when processing crafted DNSSEC responses from an attacker-controlled authoritative server. A remote attacker can send a particular sequence of crafted DNS answers to cause a denial of service.

Exploitation requires inducing the resolver to issue multiple queries for a DNSSEC-signed zone and relies on the responses arriving in a particular order and with particular timing.

ISC BIND
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
Debian Linux
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Ubuntu
Basesystem Module
Server Applications Module
openSUSE Leap
openEuler
Anolis OS
Fedora
bind9 (Ubuntu package)
bind-utils-debuginfo
libisccc161
libirs161
libisc1107-debuginfo
liblwres161
bind-chrootenv
libirs161-debuginfo
bind-debuginfo
bind
libisccfg163-debuginfo
libdns1110-debuginfo
libisccc161-debuginfo
bind-utils
libdns1110
libbind9-161-debuginfo
libbind9-161
libisccfg163
bind-devel
libisc1107-debuginfo-32bit
libisc1107-32bit
python-bind
bind-doc
libisc1107
liblwres161-debuginfo
bind-debugsource
python3-bind
bind-license
bind-dnssec-doc
bind-pkcs11-utils
bind-pkcs11-libs
bind-pkcs11-devel
bind-pkcs11
bind-libs
bind-dnssec-utils
bind-chroot
bind (Red Hat package) main
bind9-next
bind-dyndb-ldap
bind9 (Debian package)

Install security update from vendor's website.

ISC BIND - addressed in versions 9.20.29, 9.20.29-s1
bind9 (Ubuntu package) - addressed in versions 1:9.9.5.dfsg-3ubuntu0.19+esm15, 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11, 1:9.11.3+dfsg-1ubuntu1.19+esm6, 1:9.18.30-0ubuntu0.20.04.2+esm3, 1:9.18.39-0ubuntu0.22.04.7, 1:9.18.39-0ubuntu0.24.04.8, 1:9.20.24-1ubuntu0.4
bind-utils-debuginfo - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libisccc161 - update to 9.11.22-3.77.1
libirs161 - update to 9.11.22-3.77.1
libisc1107-debuginfo - update to 9.11.22-3.77.1
liblwres161 - update to 9.11.22-3.77.1
bind-chrootenv - update to 9.11.22-3.77.1
libirs161-debuginfo - update to 9.11.22-3.77.1
bind-debuginfo - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
bind - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libisccfg163-debuginfo - update to 9.11.22-3.77.1
libdns1110-debuginfo - update to 9.11.22-3.77.1
libisccc161-debuginfo - update to 9.11.22-3.77.1
bind-utils - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libdns1110 - update to 9.11.22-3.77.1
libbind9-161-debuginfo - update to 9.11.22-3.77.1
libbind9-161 - update to 9.11.22-3.77.1
libisccfg163 - update to 9.11.22-3.77.1
bind-devel - update to 9.11.22-3.77.1
libisc1107-debuginfo-32bit - update to 9.11.22-3.77.1
libisc1107-32bit - update to 9.11.22-3.77.1
python-bind - update to 9.11.22-3.77.1
bind-doc - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
libisc1107 - update to 9.11.22-3.77.1
liblwres161-debuginfo - update to 9.11.22-3.77.1
bind-debugsource - addressed in versions 9.11.22-3.77.1, 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1, 9.20.29-150700.3.32.2
python3-bind - update to 9.16.23-33
bind-license - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-dnssec-doc - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-utils - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-pkcs11-utils - update to 9.16.23-33
bind-pkcs11-libs - update to 9.16.23-33
bind-pkcs11-devel - update to 9.16.23-33
bind-debugsource - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-pkcs11 - update to 9.16.23-33
bind-libs - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-dnssec-utils - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-devel - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-debuginfo - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind-chroot - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
bind - addressed in versions 9.16.23-33, 9.18.21-14, 9.20.21-7
python3-bind - addressed in versions 9.16.50-150400.5.70.1, 9.16.50-150500.8.46.1
bind (Red Hat package) main - update to 9.18.33-15.el10_2.13
bind - addressed in versions 9.18.51^git20261003.d0a87358-2.fc43, 9.18.51^git20261003.d0a87358-2.fc44, 9.18.51^git20261003.d0a87358-11.fc46
bind - update to 9.20.29-1
bind-chroot - update to 9.20.29-1
bind-devel - update to 9.20.29-1
bind-dnssec-utils - update to 9.20.29-1
bind-libs - update to 9.20.29-1
bind-utils - update to 9.20.29-1
bind-dnssec-doc - update to 9.20.29-1
bind-doc - update to 9.20.29-1
bind-license - update to 9.20.29-1
bind9-next - addressed in versions 9.21.26-1.fc43, 9.21.26-1.fc44, 9.21.26-1.fc45
bind-dyndb-ldap - addressed in versions 11.11-15.fc43, 11.11-17.fc44, 11.11-18.fc46
bind9 (Debian package) - update to 1:9.20.29-1~deb13u1

• https://kb.isc.org/docs/cve-2026-19662

• Multiple vulnerabilities in ISC BIND
• Debian update for bind9
• SUSE update for bind
• Anolis OS update for bind
• Fedora 45 update for bind9-next
• Fedora 44 update for bind9-next
• Fedora 43 update for bind9-next
• openEuler 24.03 LTS SP1 update for bind
• openEuler 22.03 LTS SP4 update for bind
• openEuler 24.03 LTS SP4 update for bind
• openEuler 24.03 LTS SP3 update for bind
• Fedora 43 update for bind, bind-dyndb-ldap
• Fedora 44 update for bind, bind-dyndb-ldap
• Fedora 46 update for bind, bind-dyndb-ldap
• SUSE update for bind
• SUSE update for bind
• Red Hat Enterprise Linux 10 update for bind
• Ubuntu update for bind9
• SUSE update for bind