Resource exhaustion in ISC BIND - CVE-2026-1519

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU124616

Resource exhaustion in ISC BIND - CVE-2026-1519

Published: March 25, 2026


Vulnerability identifier: #VU124616
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-2026-1519
CWE-ID: CWE-400
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 improper input validation in the DNSSEC validation component when handling NSEC3 records during insecure delegation validation. A remote attacker can send a specially crafted DNS zone response to cause excessive CPU load on the resolver.

Resolvers performing DNSSEC validation are affected; authoritative-only servers are generally not affected unless they perform recursive queries.


Affected software

ISC BIND
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
Debian Linux
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
SUSE Multi-Linux Manager Client Tools for SLE Micro
SUSE Manager Client Tools for SLE Micro
IBM i
Anolis OS
Red Hat Enterprise Linux for IBM z Systems
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Basesystem Module
Server Applications Module
openSUSE Leap
openEuler
Ubuntu
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
bind (Red Hat package) main
bind-export-devel
bind-debugsource
bind-debuginfo
bind-devel
bind-export-libs
bind-libs
bind-libs-lite
bind-pkcs11-devel
bind-utils
bind-pkcs11
python3-bind
bind-chroot
bind
liblwres161-debuginfo
libisc1107-debuginfo
libisccc161-debuginfo
libdns1110-debuginfo
liblwres161
libdns1110
libbind9-161-debuginfo
libisccfg163
bind-utils-debuginfo
bind-chrootenv
libisccfg163-debuginfo
libisc1107
libisccc161
libbind9-161
libirs161
bind-doc
python-bind
libisc1107-32bit
libisc1107-debuginfo-32bit
libirs161-debuginfo
bind-license
bind-sdb-chroot
bind-sdb
bind-pkcs11-utils
bind-pkcs11-libs
bind-lite-devel
libirs1601-64bit
libirs1601-debuginfo
libisccfg1600
libisccfg1600-debuginfo
libisccc1600-64bit
libdns1605-64bit
libbind9-1600-64bit
libisccfg1600-64bit
libisc1606-64bit
libisccc1600
libirs1601
libbind9-1600-debuginfo
libisccc1600-debuginfo
libisc1606-debuginfo
libns1604
libbind9-1600
libisc1606
libns1604-debuginfo
libdns1605-debuginfo
libdns1605
libirs-devel
bind9.16 (Red Hat package)
bind9.16-chroot
bind9.16
bind9.16-devel
bind9.16-dnssec-utils
bind9.16-libs
bind9.16-utils
bind9.16-doc
bind9.16-license
python3-bind9.16
bind-dnssec-doc
bind-dnssec-utils
bind9.18 (Red Hat package)
bind9 (Ubuntu package)
bind9 (Debian package)
bind9-next
bind-dyndb-ldap
Red Hat OpenShift Container Platform

How to mitigate CVE-2026-1519

Install security update from vendor's website.

ISC BIND - addressed in versions 9.18.47, 9.18.47-S1, 9.20.21, 9.20.21-S1, 9.21.20
Red Hat OpenShift Container Platform - addressed in versions 4.12.93, 4.14.69, 4.19.36
bind (Red Hat package) main - addressed in versions 9.8.2-0.68.rc1.el6_10.18, 9.11.26-4.el8_4.9, 9.11.36-8.el8_8.9, 9.11.36-16.el8_10.7, 9.16.23-11.el9_2.10, 9.16.23-18.el9_4.11, 9.16.23-31.el9_6.3, 9.16.23-34.el9_7.2, 9.18.33-4.el10_0.3, 9.18.33-10.el10_1.3
bind-export-devel - update to 9.11.21-23
bind-debugsource - addressed in versions 9.11.21-23, 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-debuginfo - addressed in versions 9.11.21-23, 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-devel - addressed in versions 9.11.21-23, 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-export-libs - update to 9.11.21-23
bind-libs - addressed in versions 9.11.21-23, 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-libs-lite - update to 9.11.21-23
bind-pkcs11-devel - addressed in versions 9.11.21-23, 9.16.23-29
bind-utils - addressed in versions 9.11.21-23, 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-pkcs11 - addressed in versions 9.11.21-23, 9.16.23-29
python3-bind - addressed in versions 9.11.21-23, 9.16.23-29
bind-chroot - addressed in versions 9.11.21-23, 9.16.23-29, 9.18.21-6, 9.18.21-7
bind - addressed in versions 9.11.21-23, 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-debuginfo - addressed in versions 9.11.22-3.68.1, 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1, 9.16.50-150400.5.59.1, 9.16.50-150500.8.35.1, 9.18.33-150600.3.21.1, 9.20.21-150700.3.18.1
liblwres161-debuginfo - update to 9.11.22-3.68.1
bind-utils - addressed in versions 9.11.22-3.68.1, 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1, 9.16.50-150400.5.59.1, 9.16.50-150500.8.35.1, 9.18.33-150600.3.21.1, 9.20.21-150700.3.18.1
libisc1107-debuginfo - update to 9.11.22-3.68.1
libisccc161-debuginfo - update to 9.11.22-3.68.1
libdns1110-debuginfo - update to 9.11.22-3.68.1
liblwres161 - update to 9.11.22-3.68.1
bind-debugsource - addressed in versions 9.11.22-3.68.1, 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1, 9.16.50-150400.5.59.1, 9.16.50-150500.8.35.1, 9.18.33-150600.3.21.1, 9.20.21-150700.3.18.1
libdns1110 - update to 9.11.22-3.68.1
bind - addressed in versions 9.11.22-3.68.1, 9.16.6-150300.22.56.1, 9.16.50-150400.5.59.1, 9.16.50-150500.8.35.1, 9.18.33-150600.3.21.1, 9.20.21-150700.3.18.1
libbind9-161-debuginfo - update to 9.11.22-3.68.1
libisccfg163 - update to 9.11.22-3.68.1
bind-utils-debuginfo - addressed in versions 9.11.22-3.68.1, 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1, 9.16.50-150400.5.59.1, 9.16.50-150500.8.35.1, 9.18.33-150600.3.21.1, 9.20.21-150700.3.18.1
bind-chrootenv - addressed in versions 9.11.22-3.68.1, 9.16.6-150300.22.56.1
libisccfg163-debuginfo - update to 9.11.22-3.68.1
libisc1107 - update to 9.11.22-3.68.1
libisccc161 - update to 9.11.22-3.68.1
bind-devel - addressed in versions 9.11.22-3.68.1, 9.16.6-150300.22.56.1
libbind9-161 - update to 9.11.22-3.68.1
libirs161 - update to 9.11.22-3.68.1
bind-doc - addressed in versions 9.11.22-3.68.1, 9.16.6-150300.22.56.1, 9.16.50-150400.5.59.1, 9.16.50-150500.8.35.1, 9.18.33-150600.3.21.1, 9.20.21-150700.3.18.1
python-bind - update to 9.11.22-3.68.1
libisc1107-32bit - update to 9.11.22-3.68.1
libisc1107-debuginfo-32bit - update to 9.11.22-3.68.1
libirs161-debuginfo - update to 9.11.22-3.68.1
bind-pkcs11-devel - update to 9.11.36-16.0.1
python3-bind - update to 9.11.36-16.0.1
bind-license - update to 9.11.36-16.0.1
bind-utils - update to 9.11.36-16.0.1
bind-sdb-chroot - update to 9.11.36-16.0.1
bind-sdb - update to 9.11.36-16.0.1
bind-pkcs11-utils - update to 9.11.36-16.0.1
bind-pkcs11-libs - update to 9.11.36-16.0.1
bind-pkcs11 - update to 9.11.36-16.0.1
bind-lite-devel - update to 9.11.36-16.0.1
bind-libs-lite - update to 9.11.36-16.0.1
bind-libs - update to 9.11.36-16.0.1
bind-export-libs - update to 9.11.36-16.0.1
bind-export-devel - update to 9.11.36-16.0.1
bind-devel - update to 9.11.36-16.0.1
bind-chroot - update to 9.11.36-16.0.1
bind - update to 9.11.36-16.0.1
libirs1601-64bit - update to 9.16.6-150000.12.88.1
libirs1601-debuginfo - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libisccfg1600 - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libisccfg1600-debuginfo - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libisccc1600-64bit - update to 9.16.6-150000.12.88.1
libdns1605-64bit - update to 9.16.6-150000.12.88.1
libbind9-1600-64bit - update to 9.16.6-150000.12.88.1
libisccfg1600-64bit - update to 9.16.6-150000.12.88.1
libisc1606-64bit - update to 9.16.6-150000.12.88.1
python3-bind - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1, 9.16.50-150400.5.59.1, 9.16.50-150500.8.35.1
libisccc1600 - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libirs1601 - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libbind9-1600-debuginfo - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libisccc1600-debuginfo - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libisc1606-debuginfo - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libns1604 - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libbind9-1600 - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libisc1606 - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libns1604-debuginfo - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libdns1605-debuginfo - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libdns1605 - addressed in versions 9.16.6-150000.12.88.1, 9.16.6-150300.22.56.1
libirs-devel - update to 9.16.6-150300.22.56.1
bind9.16 (Red Hat package) - addressed in versions 9.16.23-0.7.el8_6.10, 9.16.23-0.14.el8_8.8, 9.16.23-0.22.el8_10.5
bind9.16-chroot - update to 9.16.23-0.22
bind9.16 - update to 9.16.23-0.22
bind9.16-devel - update to 9.16.23-0.22
bind9.16-dnssec-utils - update to 9.16.23-0.22
bind9.16-libs - update to 9.16.23-0.22
bind9.16-utils - update to 9.16.23-0.22
bind9.16-doc - update to 9.16.23-0.22
bind9.16-license - update to 9.16.23-0.22
python3-bind9.16 - update to 9.16.23-0.22
bind-pkcs11-libs - update to 9.16.23-29
bind-license - addressed in versions 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-dnssec-doc - addressed in versions 9.16.23-29, 9.18.21-6, 9.18.21-7
bind-pkcs11-utils - update to 9.16.23-29
bind-dnssec-utils - addressed in versions 9.16.23-29, 9.18.21-6, 9.18.21-7
bind9.18 (Red Hat package) - addressed in versions 9.18.29-4.el9_6.3, 9.18.29-5.el9_7.4
bind9 (Ubuntu package) - addressed in versions 1:9.18.39-0ubuntu0.22.04.3, 1:9.18.39-0ubuntu0.24.04.3, 1:9.20.11-1ubuntu2.2
bind - addressed in versions 9.18.47-1.fc42, 9.18.47-1.fc43, 9.18.47-1.fc44, 9.18.47-1.fc45
bind9 (Debian package) - addressed in versions 1:9.18.47-1~deb12u1, 1:9.20.21-1~deb13u1
bind9-next - addressed in versions 9.21.20-1.fc42, 9.21.20-1.fc43, 9.21.20-1.fc44
bind-dyndb-ldap - addressed in versions 11.11-10.fc42, 11.11-11.fc43, 11.11-13.fc44, 11.11-13.fc45

External References

Related Security Bulletins