CVE-2026-4738 Affecting zlib package, versions <1.4-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE323-ZLIB-22265590
- published7 Nov 2026
- disclosed24 Mar 2026
Introduced: 24 Mar 2026
CVE-2026-4738 (opens in a new tab)How to fix?
Upgrade Alpine:3.23 zlib to version 1.4-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream zlib package and not the zlib package as distributed by Alpine.
See How to fix? for Alpine:3.23 relevant fixed versions and status.
Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in OSGeo gdal (frmts/zlib/contrib/infback9 modules). This vulnerability is associated with program files inftree9.C.
This issue affects gdal: before 3.11.0.