Improper handling of highly compressed data in Apache MINA - CVE-2026-47321
Published: September 21, 2026
Vulnerability identifier: #VU151531
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: CVE-2026-47321
CWE-ID: CWE-409
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 improper handling of highly compressed data in the CompressionFilter class when inflating incoming compressed data with ZLib.inflate. A remote attacker can send specially crafted compressed data that expands to consume excessive application memory to cause a denial of service.
Affected software
Apache MINA
How to mitigate CVE-2026-47321
Install security update from vendor's website.
Apache MINA - addressed in versions 2.0.29, 2.1.13, 2.2.8