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

Wed, 01 Jul 2026 09:05:19 -0700 

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 <[email protected]> (finder)

References:

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

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