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SUSE Linux Micro Compression Error Leading to Indefinite Cycle Flaw

suse
Calendar Grey March 18, 2026
Dist Suse Esm H88
Update for zlib fixes two vulnerabilities including heap-based buffer overflow and infinite loop for SUSE systems.
An update that solves two vulnerabilities can now be installed.

Summary

## This update for zlib fixes the following issues: * CVE-2026-27171: Fixed an infinite loop via the crc32_combine64 and crc32_combine_gen64 functions due to missing checks for negative lengths. (bsc#1258392) * CVE-2023-45853: Fixed an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_6. (bsc#1216378) ## 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 Micro 6.0 zypper in -t patch SUSE-SLE-Micro-6.0-610=1 ## Package List: * SUSE Linux Micro 6.0 (aarch64 s390x x86_64) * libz1-1.2.13-7.1 * zlib-debugsource-1.2.13-7.1 * zlib-devel-1.2.13-7.1 * libz1-debuginfo-1.2.13-7.1

Topics%20covered

Topics Covered

security advisory moderate buffer overflow SuSE zlib infinite loop

References

* bsc#1216378

* bsc#1258392

Cross-

* CVE-2023-45853

* CVE-2026-27171

CVSS scores:

* CVE-2023-45853 ( SUSE ): 5.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

* CVE-2023-45853 ( NVD ): 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

* CVE-2023-45853 ( NVD ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

* CVE-2026-27171 ( SUSE ): 6.9

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

* CVE-2026-27171 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

* CVE-2026-27171 ( NVD ): 2.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

* CVE-2026-27171 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products:

* SUSE Linux Micro 6.0

An update that solves two vulnerabilities can now be installed.

##

Announcement ID: SUSE-SU-2026:20709-1
Release Date: 2026-03-09T09:56:07Z
Rating: moderate

Topics%20covered

Topics Covered

security advisory moderate buffer overflow SuSE zlib infinite loop

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