Missing release of memory after effective lifetime in ISC BIND - CVE-2026-3104
Published: March 25, 2026
Vulnerability identifier: #VU124615
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-2026-3104
CWE-ID: CWE-401
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 memory management in the DNSSEC proof preparation component when handling recursive queries for a specially crafted domain. A remote attacker can send a specially crafted domain query to cause unbounded memory consumption, leading to an out-of-memory condition and potential service termination during shutdown or reload.
Resolvers are affected; authoritative servers may be at risk if they perform recursive queries.
Affected software
ISC BIND
Debian Linux
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Basesystem Module
Server Applications Module
Ubuntu
Fedora
bind9 (Ubuntu package)
bind9 (Debian package)
bind-debuginfo
bind-utils
bind-utils-debuginfo
bind-debugsource
bind
bind-doc
bind9-next
Debian Linux
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Basesystem Module
Server Applications Module
Ubuntu
Fedora
bind9 (Ubuntu package)
bind9 (Debian package)
bind-debuginfo
bind-utils
bind-utils-debuginfo
bind-debugsource
bind
bind-doc
bind9-next
How to mitigate CVE-2026-3104
Install security update from vendor's website.
ISC BIND - addressed in versions 9.20.21, 9.20.21-S1, 9.21.20
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
bind9 (Debian package) - addressed in versions 1:9.18.47-1~deb12u1, 1:9.20.21-1~deb13u1
bind-debuginfo - update to 9.20.21-150700.3.18.1
bind-utils - update to 9.20.21-150700.3.18.1
bind-utils-debuginfo - update to 9.20.21-150700.3.18.1
bind-debugsource - update to 9.20.21-150700.3.18.1
bind - update to 9.20.21-150700.3.18.1
bind-doc - update to 9.20.21-150700.3.18.1
bind9-next - addressed in versions 9.21.20-1.fc42, 9.21.20-1.fc43, 9.21.20-1.fc44
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
bind9 (Debian package) - addressed in versions 1:9.18.47-1~deb12u1, 1:9.20.21-1~deb13u1
bind-debuginfo - update to 9.20.21-150700.3.18.1
bind-utils - update to 9.20.21-150700.3.18.1
bind-utils-debuginfo - update to 9.20.21-150700.3.18.1
bind-debugsource - update to 9.20.21-150700.3.18.1
bind - update to 9.20.21-150700.3.18.1
bind-doc - update to 9.20.21-150700.3.18.1
bind9-next - addressed in versions 9.21.20-1.fc42, 9.21.20-1.fc43, 9.21.20-1.fc44