CVE-2026-54522: MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure

Overview

Severity

Medium (CVSS 5.4)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-08-07

Last Updated

2026-09-13

EPSS Score

0.16% (percentile: 6.1%)

Affected Products (1)

Other

• 21672-17084

Security Updates (1)

• CBL-Mariner Releases

Revision History

• 2026-08-07: Information published.
• 2026-08-13: Information published.
• 2026-09-05: Information published.
• 2026-09-13: Information published.