# zlib (RubyGems) vulnerabilities

1 known vulnerability (1 low), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://rubygems.org/gems/zlib

## Advisories (1)

### [CVE-2026-27820](https://cve.now/CVE-2026-27820): zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption

- Severity: Low 1.7
- Published: Apr 16, 2026
- Affected: from 3.2.0, fixed in 3.2.3; from 3.1.0, fixed in 3.1.2; fixed in 3.0.1.

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