CVE-2026-54399

HIGH

Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration

Title source: cna

Description

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

References (2)

Core 2

Core References

Vendor Advisory vendor-advisory

https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy

Mailing List

http://www.openwall.com/lists/oss-security/2026/07/01/4

Scores

CVSS v3 7.5

EPSS 0.0041

EPSS Percentile 32.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-400

Status published

Products (2)

Apache Software Foundation/Apache HttpComponents Core 5.0-alpha - 5.4.2

Apache Software Foundation/Apache HttpComponents Core 5.5-alpha - 5.5-beta1

Published Jul 01, 2026

Tracked Since Jul 01, 2026