High severity · published Oct 28, 2026
CVE-2026-106972
An uncontrolled recursion in the MessagePack\BufferUnpacker::unpack() component of rybakit/msgpack v0.11.0 allows attackers to cause a Denial of Service (DoS) via a crafted input
New
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
Uncontrolled recursion in MessagePack\BufferUnpacker::unpack() in rybakit/msgpack versions prior to 0.11.0 allows attackers to cause a denial of service through memory exhaustion when an application decodes deeply nested, attacker-controlled MessagePack input.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-106972
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-106972
github.com
https://github.com/rybakit/msgpack.php
github.com
https://github.com/rybakit/msgpack.php/releases/tag/v0.11.0
github.com
https://github.com/diptendukar/security-advisories/blob/main/CVE-2026-106972.md