SUSE-SU-2026:3884-1: important: Security update for unbound
SLE-SECURITY-UPDATES
null at suse.de
Mon Aug 31 20:43:14 UTC 2026
# Security update for unbound
Announcement ID: SUSE-SU-2026:3884-1
Release Date: 2026-08-31T14:33:58Z
Rating: important
References:
* bsc#1271875
* bsc#1271876
* bsc#1271877
* bsc#1271880
* bsc#1271881
* bsc#1271882
* bsc#1271883
* bsc#1271884
* bsc#1271886
* bsc#1271887
* bsc#1271889
* bsc#1271890
* bsc#1271892
* bsc#1271893
* bsc#1271894
* bsc#1271895
* bsc#1271896
Cross-References:
* CVE-2026-40691
* CVE-2026-42955
* CVE-2026-44621
* CVE-2026-44687
* CVE-2026-44690
* CVE-2026-46582
* CVE-2026-50046
* CVE-2026-50243
* CVE-2026-50248
* CVE-2026-50251
* CVE-2026-50252
* CVE-2026-54478
* CVE-2026-55708
* CVE-2026-55717
* CVE-2026-55990
* CVE-2026-56416
* CVE-2026-56444
CVSS scores:
* CVE-2026-40691 ( SUSE ): 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-2026-40691 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-40691 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-42955 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
* CVE-2026-42955 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-42955 ( NVD ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-44621 ( SUSE ): 6.9
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
* CVE-2026-44621 ( SUSE ): 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-44621 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-44687 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
* CVE-2026-44687 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-44687 ( NVD ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-44690 ( SUSE ): 8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
* CVE-2026-44690 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
* CVE-2026-44690 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-46582 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
* CVE-2026-46582 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-46582 ( NVD ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-50046 ( SUSE ): 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-2026-50046 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-50046 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-50243 ( SUSE ): 8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-50243 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-50243 ( NVD ): 6.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
* CVE-2026-50243 ( NVD ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-50248 ( SUSE ): 8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-50248 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-50248 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
* CVE-2026-50251 ( SUSE ): 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-2026-50251 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-50251 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-50252 ( SUSE ): 8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-50252 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-50252 ( NVD ): 5.7
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
* CVE-2026-50252 ( NVD ): 9.3 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
* CVE-2026-54478 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
* CVE-2026-54478 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-54478 ( NVD ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-55708 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
* CVE-2026-55708 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-55708 ( NVD ): 3.1 CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
* CVE-2026-55717 ( SUSE ): 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-2026-55717 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-55717 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-55990 ( SUSE ): 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-2026-55990 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-55990 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56416 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
* CVE-2026-56416 ( SUSE ): 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
* CVE-2026-56416 ( NVD ): 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
* CVE-2026-56444 ( SUSE ): 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-2026-56444 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56444 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products:
* SUSE Linux Enterprise High Performance Computing 15 SP4
* SUSE Linux Enterprise High Performance Computing 15 SP5
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
* SUSE Linux Enterprise Micro 5.5
* SUSE Linux Enterprise Server 15 SP4
* SUSE Linux Enterprise Server 15 SP4 LTSS
* SUSE Linux Enterprise Server 15 SP5
* SUSE Linux Enterprise Server 15 SP5 LTSS
* SUSE Linux Enterprise Server for SAP Applications 15 SP4
* SUSE Linux Enterprise Server for SAP Applications 15 SP5
An update that solves 17 vulnerabilities can now be installed.
## Description:
This update for unbound fixes the following issues:
Update to version 1.25.2.
Security issues fixed:
* CVE-2026-40691: DoS due to heap overflow via single bad DNSCrypt query over
TCP (bsc#1271875).
* CVE-2026-42955: Ghost domain window can be extended by up to one cached TTL
configured value for A/AAAA glue records (bsc#1271892).
* CVE-2026-44621: Libunbound applications configured with `unwanted-reply-
threshold` could eventually be abruptly terminated (bsc#1271876).
* CVE-2026-44687: Off-by-one error in `harden-below-nxdomain` logic can shadow
a stub/forward zone by a legitimate parent's `NXDOMAIN` (bsc#1271893).
* CVE-2026-44690: Cross-zone wildcard cache poisoning via `RRSIG.labels`
manipulation (bsc#1271877).
* CVE-2026-46582: Replay of a wildcard `rrset` as another piece of data
triggers poisoning in the server expired reply path (bsc#1271894).
* CVE-2026-50046: Possible heap use-after-free in an error path when a DoT
forwarded query is jostled out (bsc#1271882).
* CVE-2026-50243: `response-ip`/`rpz` can rewrite BOGUS answers instead of
returning SERVFAIL (bsc#1271880).
* CVE-2026-50248: BOGUS configured primary hostname accepted for XFR in
auth/rpz zones (bsc#1271881).
* CVE-2026-50251: Attacker supplied `0.0.0.0`/`::` glue triggers defensive
full-cache flush (bsc#1271883).
* CVE-2026-50252: Possible cache poisoning attack by mapping source port
population per thread (bsc#1271884).
* CVE-2026-54478: DNS Cookie bypass when proxy-protocol with with `answer-
cookie:yes` is used (bsc#1271895).
* CVE-2026-55708: Privacy/configuration issue when adding local data in views
through `unbound-control` (bsc#1271896).
* CVE-2026-55717: `serve-expired-client-timeout` and `response-ip` CNAME
redirect could lead to a crash (bsc#1271886).
* CVE-2026-55990: Crash via crafted client UDP query due to DNSCrypt faulty
configuration (bsc#1271887).
* CVE-2026-56416: Possible heap buffer overflow when validator canonicalizes
RDATA that contains domain name (bsc#1271889).
* CVE-2026-56444: Degradation of resolution service when `discard-timeout` and
`serve-expired-client-timeout` are combined in unusual configuration
(bsc#1271890).
Other updates and bugfixes:
* Version 1.25.2:
* For a complete list of additional changes see the changelog at
https://nlnetlabs.nl/projects/unbound/download/.
* Update `unbound.keyring`.
## Patch Instructions:
To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-3884=1
* SUSE Linux Enterprise Server for SAP Applications 15 SP5
zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-3884=1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-3884=1
* SUSE Linux Enterprise Server for SAP Applications 15 SP4
zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP4-2026-3884=1
* SUSE Linux Enterprise Server 15 SP4 LTSS
zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-3884=1
* SUSE Linux Enterprise Micro 5.5
zypper in -t patch SUSE-SLE-Micro-5.5-2026-3884=1
* SUSE Linux Enterprise Server 15 SP5 LTSS
zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-3884=1
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-3884=1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-3884=1
## Package List:
* SUSE Linux Enterprise Server 15 SP5 LTSS (aarch64 ppc64le s390x x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (aarch64
x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (aarch64
x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
* SUSE Linux Enterprise Server 15 SP4 LTSS (aarch64 ppc64le s390x x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (aarch64
x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
* SUSE Linux Enterprise Micro 5.5 (aarch64 ppc64le s390x x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* SUSE Linux Enterprise Server for SAP Applications 15 SP4 (ppc64le x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (aarch64
x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
* SUSE Linux Enterprise Server for SAP Applications 15 SP5 (ppc64le x86_64)
* unbound-debuginfo-1.25.2-150100.10.28.1
* unbound-anchor-debuginfo-1.25.2-150100.10.28.1
* unbound-debugsource-1.25.2-150100.10.28.1
* unbound-anchor-1.25.2-150100.10.28.1
* libunbound8-1.25.2-150100.10.28.1
* libunbound8-debuginfo-1.25.2-150100.10.28.1
* unbound-devel-1.25.2-150100.10.28.1
## References:
* https://www.suse.com/security/cve/CVE-2026-40691.html
* https://www.suse.com/security/cve/CVE-2026-42955.html
* https://www.suse.com/security/cve/CVE-2026-44621.html
* https://www.suse.com/security/cve/CVE-2026-44687.html
* https://www.suse.com/security/cve/CVE-2026-44690.html
* https://www.suse.com/security/cve/CVE-2026-46582.html
* https://www.suse.com/security/cve/CVE-2026-50046.html
* https://www.suse.com/security/cve/CVE-2026-50243.html
* https://www.suse.com/security/cve/CVE-2026-50248.html
* https://www.suse.com/security/cve/CVE-2026-50251.html
* https://www.suse.com/security/cve/CVE-2026-50252.html
* https://www.suse.com/security/cve/CVE-2026-54478.html
* https://www.suse.com/security/cve/CVE-2026-55708.html
* https://www.suse.com/security/cve/CVE-2026-55717.html
* https://www.suse.com/security/cve/CVE-2026-55990.html
* https://www.suse.com/security/cve/CVE-2026-56416.html
* https://www.suse.com/security/cve/CVE-2026-56444.html
* https://bugzilla.suse.com/show_bug.cgi?id=1271875
* https://bugzilla.suse.com/show_bug.cgi?id=1271876
* https://bugzilla.suse.com/show_bug.cgi?id=1271877
* https://bugzilla.suse.com/show_bug.cgi?id=1271880
* https://bugzilla.suse.com/show_bug.cgi?id=1271881
* https://bugzilla.suse.com/show_bug.cgi?id=1271882
* https://bugzilla.suse.com/show_bug.cgi?id=1271883
* https://bugzilla.suse.com/show_bug.cgi?id=1271884
* https://bugzilla.suse.com/show_bug.cgi?id=1271886
* https://bugzilla.suse.com/show_bug.cgi?id=1271887
* https://bugzilla.suse.com/show_bug.cgi?id=1271889
* https://bugzilla.suse.com/show_bug.cgi?id=1271890
* https://bugzilla.suse.com/show_bug.cgi?id=1271892
* https://bugzilla.suse.com/show_bug.cgi?id=1271893
* https://bugzilla.suse.com/show_bug.cgi?id=1271894
* https://bugzilla.suse.com/show_bug.cgi?id=1271895
* https://bugzilla.suse.com/show_bug.cgi?id=1271896
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