Buffer Overflow Affecting zlib package, versions <3.0.1>=3.1.0, <3.1.2>=3.2.0, <3.2.3
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-RUBY-ZLIB-15470135
- published12 Mar 2026
- disclosed7 Mar 2026
- creditNathaniel Oh
Introduced: 7 Mar 2026
NewCVE-2026-27820 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade zlib to version 3.0.1, 3.1.2, 3.2.3 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Overflow via the zstream_buffer_ungets() function. An attacker can cause memory corruption by providing input that causes the buffer length to exceed its capacity, leading to a buffer overflow during memory operations.