Vulnerability Database · RubyGems · zlib · Version
zlib 3.2.1
3.2.1 is affected by 1 vulnerability.
The vulnerabilities that cover this exact version are listed below with the fixed version to move to. The upgrade Vulert recommends: 3.2.4.
Critical 0 High 0 Medium 1 Low 0 Unrated 0
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Released 17 Dec 2024
Licence Ruby
Also known from other sources 1
Newer releases 17
Database updated 23/Oct/2026
Release and licence data published by RubyGems. Licence information is not legal advice.
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01 Vulnerabilities affecting this version
zlib 3.2.1 vulnerabilities
1 vulnerability cover zlib 3.2.1. Open the full list in the database.
| Vulnerability | Severity | Fixed version | Disclosed |
|---|---|---|---|
| CVE-2026-27820: Buffer Overflow in Zlib Package's GzipReader Leading to Memory Corruption | 5.9 medium | 3.2.3 | 16 Apr 2026 |
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Questions
About zlib 3.2.1
Is zlib 3.2.1 vulnerable?
Yes. 1 vulnerability in the Vulert database cover zlib 3.2.1: 0 critical, 0 high, 1 medium and 0 low. The upgrade Vulert recommends is 3.2.4, and each entry above names the fixed version to move to.
Which version of zlib should I use instead of 3.2.1?
3.2.4 is the version Vulert recommends for this release line. The version table on the package page lists every release with the vulnerabilities recorded against it.
Is 3.2.1 the latest release of zlib?
No. 3.2.1 was published 17 Dec 2024, and newer releases exist. Newer is not automatically safer — the version table on the package page shows what each release carries.
How do I monitor zlib for upcoming vulnerabilities?
Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the zlib version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.