CVE-2026-107299: msgpack5: Reserved byte can cause unbounded stream buffering

Overview

Severity

Medium (CVSS 5.9)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Oct

Released

2026-10-10

EPSS Score

0.39% (percentile: 31.0%)

Affected Products (1)

Other

• 21665-17084

Revision History

• 2026-10-10: Information published.