oss-security - CVE-2026-54399: Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <c4e49725-716f-3b8e-37d0-4a8908d997b4@apache.org>
Date: Wed, 01 Jul 2026 13:12:32 +0000
From: Oleg Kalnichevski <olegk@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-54399: Apache HttpComponents Core: Unbounded HTTP
 Header/Line Length in Default Configuration 

Severity: important 

Affected versions:

- Apache HttpComponents Core (org.apache.httpcomponents.core5:httpcore5) 5.5-beta1
- Apache HttpComponents Core (org.apache.httpcomponents.core5:httpcore5) 5.4.2

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

Credit:

Henry Huang <zhuang3@...pal.com> (finder)

References:

https://hc.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-54399

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.