Use After Free Affecting msgpack package, versions >=1.0.0, <1.8.2
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.
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-MSGPACK-17705230
- published30 Jun 2026
- disclosed29 Jun 2026
- creditpranjalithakur
Introduced: 29 Jun 2026
CVE-2026-54522 (opens in a new tab)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.