CVE-2026-54399

Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length

Score

CVSS 3.1 7.5 High

Status

Analyzed - security@apache.org

Published

2026-07-01

Last modified

2026-10-25

Weaknesses

CWE-400

Affected products

• Httpcomponents Core (Apache)
• Apache Httpcomponents Core (Apache Software Foundation)

References

• https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy
• http://www.openwall.com/lists/oss-security/2026/07/01/4