Improper handling of highly compressed data in Async-http-client - #VU152425
Published: September 28, 2026
Vulnerability identifier: #VU152425
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-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 WebSocket permessage-deflate decompression handler when processing compressed WebSocket messages. A remote attacker can send a specially crafted compressed WebSocket message to cause a denial of service.
Only applications that enable WebSocket compression are affected.
Affected software
Async-http-client
Remediation
Install security update from vendor's website.
Async-http-client - update to 3.0.14