SUSE-SU-2026:4021-1: important: Security update for c-ares
SLE-SECURITY-UPDATES
null at suse.de
Mon Sep 7 12:41:37 UTC 2026
# Security update for c-ares
Announcement ID: SUSE-SU-2026:4021-1
Release Date: 2026-09-07T07:42:27Z
Rating: important
References:
* bsc#1220279
* bsc#1240955
* bsc#1254738
* bsc#1270416
* bsc#1276290
* bsc#1276291
Cross-References:
* CVE-2024-25629
* CVE-2025-31498
* CVE-2025-62408
* CVE-2026-33630
* CVE-2026-69184
* CVE-2026-69186
CVSS scores:
* CVE-2024-25629 ( SUSE ): 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
* CVE-2024-25629 ( NVD ): 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
* CVE-2024-25629 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2025-31498 ( SUSE ): 8.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
* CVE-2025-31498 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
* CVE-2025-31498 ( NVD ): 8.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/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-2025-62408 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2025-62408 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-33630 ( 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-2026-33630 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-33630 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-69184 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-69186 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Products:
* Basesystem Module 15-SP7
* SUSE Linux Enterprise Desktop 15 SP7
* 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 5.3
* SUSE Linux Enterprise Micro 5.4
* SUSE Linux Enterprise Micro 5.5
* SUSE Linux Enterprise Micro for Rancher 5.3
* SUSE Linux Enterprise Micro for Rancher 5.4
* SUSE Linux Enterprise Real Time 15 SP7
* 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 15 SP6
* SUSE Linux Enterprise Server 15 SP6 LTSS
* SUSE Linux Enterprise Server 15 SP7
* SUSE Linux Enterprise Server for SAP Applications 15 SP4
* SUSE Linux Enterprise Server for SAP Applications 15 SP5
* SUSE Linux Enterprise Server for SAP Applications 15 SP6
* SUSE Linux Enterprise Server for SAP Applications 15 SP7
An update that solves six vulnerabilities can now be installed.
## Description:
This update for c-ares fixes the following issues:
* CVE-2024-25629: out of bounds read in ares__read_line() (bsc#1220279).
* CVE-2025-31498: use-after-free in read_answers() when process_answer() may
re-enqueue a query (bsc#1240955).
* CVE-2025-62408: c-ares 1.32.3-1.34.5 use after free() (bsc#1254738).
* CVE-2026-33630: Use-after-free / double-free in c-ares query-completion
handling, remotely triggerable via ares_getaddrinfo() over TCP
(bsc#1270416).
* CVE-2026-69184: CPU-exhaustion denial of service via unbounded DNS name
compression pointer chains (bsc#1276290).
* CVE-2026-69186: Memory-amplification denial of service via unvalidated DNS
header record counts (bsc#1276291).
Changes for c-ares:
* updated to 1.36.8.
## 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 Server for SAP Applications 15 SP4
zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP4-2026-4021=1
* SUSE Linux Enterprise Server 15 SP6 LTSS
zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-4021=1
* SUSE Linux Enterprise Micro for Rancher 5.4
zypper in -t patch SUSE-SLE-Micro-5.4-2026-4021=1
* SUSE Linux Enterprise Micro 5.4
zypper in -t patch SUSE-SLE-Micro-5.4-2026-4021=1
* SUSE Linux Enterprise Server for SAP Applications 15 SP5
zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-4021=1
* SUSE Linux Enterprise Micro 5.5
zypper in -t patch SUSE-SLE-Micro-5.5-2026-4021=1
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-4021=1
* SUSE Linux Enterprise Server 15 SP5 LTSS
zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-4021=1
* SUSE Linux Enterprise Server for SAP Applications 15 SP6
zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-4021=1
* Basesystem Module 15-SP7
zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-4021=1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-4021=1
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-4021=1
* SUSE Linux Enterprise Server 15 SP4 LTSS
zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-4021=1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-4021=1
* SUSE Linux Enterprise Micro for Rancher 5.3
zypper in -t patch SUSE-SLE-Micro-5.3-2026-4021=1
* SUSE Linux Enterprise Micro 5.3
zypper in -t patch SUSE-SLE-Micro-5.3-2026-4021=1
## Package List:
* SUSE Linux Enterprise Server for SAP Applications 15 SP5 (ppc64le x86_64)
* c-ares-devel-1.34.8-150000.3.29.1
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Server 15 SP5 LTSS (aarch64 ppc64le s390x x86_64)
* c-ares-devel-1.34.8-150000.3.29.1
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (aarch64
x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* c-ares-devel-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64)
* c-ares-devel-1.34.8-150000.3.29.1
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Micro 5.5 (aarch64 ppc64le s390x x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Server 15 SP4 LTSS (aarch64 ppc64le s390x x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* c-ares-devel-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Server for SAP Applications 15 SP4 (ppc64le x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* c-ares-devel-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Micro for Rancher 5.3 (aarch64 s390x x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Micro 5.3 (aarch64 s390x x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* c-ares-devel-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (aarch64
x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* c-ares-devel-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
* c-ares-devel-1.34.8-150000.3.29.1
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (aarch64
x86_64)
* c-ares-devel-1.34.8-150000.3.29.1
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (aarch64
x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* c-ares-devel-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Micro for Rancher 5.4 (aarch64 s390x x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
* SUSE Linux Enterprise Micro 5.4 (aarch64 s390x x86_64)
* c-ares-debugsource-1.34.8-150000.3.29.1
* libcares2-1.34.8-150000.3.29.1
* libcares2-debuginfo-1.34.8-150000.3.29.1
## References:
* https://www.suse.com/security/cve/CVE-2024-25629.html
* https://www.suse.com/security/cve/CVE-2025-31498.html
* https://www.suse.com/security/cve/CVE-2025-62408.html
* https://www.suse.com/security/cve/CVE-2026-33630.html
* https://www.suse.com/security/cve/CVE-2026-69184.html
* https://www.suse.com/security/cve/CVE-2026-69186.html
* https://bugzilla.suse.com/show_bug.cgi?id=1220279
* https://bugzilla.suse.com/show_bug.cgi?id=1240955
* https://bugzilla.suse.com/show_bug.cgi?id=1254738
* https://bugzilla.suse.com/show_bug.cgi?id=1270416
* https://bugzilla.suse.com/show_bug.cgi?id=1276290
* https://bugzilla.suse.com/show_bug.cgi?id=1276291
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