SUSE-SU-2026:3885-1: important: Security update for unbound

OPENSUSE-SECURITY-UPDATES <[email protected]>
Newsgroups gmane.linux.suse.security.announce
Message-ID <178820893582.1109.2927173568681061362@2eb657abeeed> 
# Security update for unbound

Announcement ID: SUSE-SU-2026:3885-1  
Release Date: 2026-08-31T14:34:38Z  
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-2026-40622
  * 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-2026-40622 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-40622 ( NVD ):  6.6
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/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-2026-40622 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  * 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:

  * Basesystem Module 15-SP7
  * openSUSE Leap 15.6
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP6
  * SUSE Linux Enterprise Server 15 SP6 LTSS
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7
  * SUSE Package Hub 15 15-SP7

  
  
An update that solves 18 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:

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-3885=1

  * openSUSE Leap 15.6  
    zypper in -t patch SUSE-2026-3885=1

  * SUSE Package Hub 15 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-3885=1

  * SUSE Linux Enterprise Server 15 SP6 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-3885=1

  * SUSE Linux Enterprise Server for SAP Applications 15 SP6  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-3885=1

## Package List:

  * SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)
    * libunbound8-1.25.2-150600.23.19.1
    * unbound-devel-1.25.2-150600.23.19.1
    * unbound-anchor-1.25.2-150600.23.19.1
    * unbound-anchor-debuginfo-1.25.2-150600.23.19.1
    * unbound-debuginfo-1.25.2-150600.23.19.1
    * unbound-debugsource-1.25.2-150600.23.19.1
    * libunbound8-debuginfo-1.25.2-150600.23.19.1
  * openSUSE Leap 15.6 (aarch64 i586 ppc64le s390x x86_64)
    * libunbound-devel-mini-1.25.2-150600.23.19.1
    * libunbound-devel-mini-debugsource-1.25.2-150600.23.19.1
    * unbound-debugsource-1.25.2-150600.23.19.1
    * libunbound8-1.25.2-150600.23.19.1
    * libunbound-devel-mini-debuginfo-1.25.2-150600.23.19.1
    * unbound-devel-1.25.2-150600.23.19.1
    * unbound-anchor-1.25.2-150600.23.19.1
    * unbound-python-debuginfo-1.25.2-150600.23.19.1
    * unbound-anchor-debuginfo-1.25.2-150600.23.19.1
    * unbound-debuginfo-1.25.2-150600.23.19.1
    * unbound-1.25.2-150600.23.19.1
    * unbound-python-1.25.2-150600.23.19.1
    * libunbound8-debuginfo-1.25.2-150600.23.19.1
  * openSUSE Leap 15.6 (noarch)
    * unbound-munin-1.25.2-150600.23.19.1
  * SUSE Package Hub 15 15-SP7 (aarch64 ppc64le s390x x86_64)
    * unbound-debugsource-1.25.2-150600.23.19.1
    * unbound-python-debuginfo-1.25.2-150600.23.19.1
    * unbound-debuginfo-1.25.2-150600.23.19.1
    * unbound-1.25.2-150600.23.19.1
    * unbound-python-1.25.2-150600.23.19.1
  * Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * libunbound8-1.25.2-150600.23.19.1
    * unbound-devel-1.25.2-150600.23.19.1
    * unbound-anchor-1.25.2-150600.23.19.1
    * unbound-anchor-debuginfo-1.25.2-150600.23.19.1
    * unbound-debuginfo-1.25.2-150600.23.19.1
    * unbound-debugsource-1.25.2-150600.23.19.1
    * libunbound8-debuginfo-1.25.2-150600.23.19.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64)
    * libunbound8-1.25.2-150600.23.19.1
    * unbound-devel-1.25.2-150600.23.19.1
    * unbound-anchor-1.25.2-150600.23.19.1
    * unbound-anchor-debuginfo-1.25.2-150600.23.19.1
    * unbound-debuginfo-1.25.2-150600.23.19.1
    * unbound-debugsource-1.25.2-150600.23.19.1
    * libunbound8-debuginfo-1.25.2-150600.23.19.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-40622.html
  * 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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