Buffer Overflow Affecting zlib package, versions <3.0.1>=3.1.0, <3.1.2>=3.2.0, <3.2.3
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-RUBY-ZLIB-15470135
- published12 Mar 2026
- disclosed7 Mar 2026
- creditNathaniel Oh
Introduced: 7 Mar 2026
CVE-2026-27820 (opens in a new tab)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.