Uncontrolled Recursion in msgpack5 - #VU152782
Published: September 29, 2026
Vulnerability identifier: #VU152782
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the streaming decoder when processing a single chunk containing many small valid MessagePack values. A remote attacker can send a crafted chunk containing many concatenated MessagePack values to cause a denial of service.
Affected software
msgpack5
Remediation
Install security update from vendor's website.
msgpack5 - update to 6.1.0