Use After Free Affecting msgpack package, versions >=1.0.0, <1.8.2
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Test your applications- Snyk IDSNYK-RUBY-MSGPACK-17705230
- published30 Jun 2026
- disclosed29 Jun 2026
- creditpranjalithakur
Introduced: 29 Jun 2026
NewCVE-2026-54522 (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 msgpack to version 1.8.2 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the clear function. An attacker can access or manipulate memory contents from another buffer by triggering the reuse of a memory page after it has been returned to the shared pool, leading to unintended disclosure or modification of data.