OPENSUSE-SU-2026:20487-1: zlib security update

OPENSUSE-SU-2026:20487-1, released April 9, 2026, fixes 2 CVEs in zlib (version 1.2.13-160000.3.1). None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0345

89th percentile

Priority of the 2 CVEs

Patch now 0
                                Urgent 1
                                High 0
                                Routine 1

Fixed package versions

Product	Release	Fixed in
zlib	opensuse-leap 16.0	1.2.13-160000.3.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2023-45853	minizip: MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_...	9.8	0.0345	None reported
Routine	CVE-2026-27171	zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.	5.5	0.0025	None reported

Also fixes CVE-2023-45853

SUSE-SU-2026:21151-1
zlib on sles 16.0
ALAS2023-2023-410
minizip-compat, minizip-compat-debuginfo, minizip-compat-devel and 5 more on amzn 2023
DEBIAN-CVE-2023-45853
minizip, zlib on Debian 12.15 (bookworm), Debian 13.5 (trixie), Debian 14

Vendor advisory

https://osv.dev/vulnerability/openSUSE-SU-2026:20487-1

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