Resource exhaustion in Apache HttpComponents - CVE-2026-54399
Published: August 25, 2026
Vulnerability identifier: #VU145266
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-2026-54399
CWE-ID: CWE-400
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 resource consumption in the HTTP/1.1 message parser when processing messages with an excessive number of headers or excessive header length. A remote attacker can send a specially crafted HTTP message to cause a denial of service.
The issue leads to memory exhaustion.
Affected software
Apache HttpComponents
IBM Common Licensing
IBM Common Licensing
How to mitigate CVE-2026-54399
Install security update from vendor's website.
Apache HttpComponents - update to 5.5
IBM Common Licensing - update to 9.1
IBM Common Licensing - update to 9.1