# 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.

- Web page: https://patchblox.com/security/fix/linux/opensuse-su-2026-20487-1
- Platform: Linux
- Released: Apr 9, 2026
- Priority: Urgent (Closes CVE-2023-45853, rated Critical)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/openSUSE-SU-2026:20487-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [zlib](https://patchblox.com/security/data/product/linux/zlib.md) | opensuse-leap 16.0 | 1.2.13-160000.3.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-45853](https://patchblox.com/security/data/cve/CVE-2023-45853.md) | Urgent | minizip: MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_... | 9.8 | 0.0345 |  |
| [CVE-2026-27171](https://patchblox.com/security/data/cve/CVE-2026-27171.md) | Routine | 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 |  |

---

Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.