Apache HttpComponents Core HTTP/1 header parsing can cause memory-exhaustion denial of service
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 a remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.httpcomponents.core5:httpcore5 | < 5.4.3, >= 5.5-alpha1, < 5.5-beta2 | 5.4.3, 5.5-beta2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-54399
- https://github.com/apache/httpcomponents-core/commit/d96a00fec9b2e19f8005e35681df5f6cd6e21a9e
- https://github.com/apache/httpcomponents-core/commit/fdc53a32fe0fccf098cc67e71cd125e447c759ed
- https://github.com/apache/httpcomponents-core
- https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy
- http://www.openwall.com/lists/oss-security/2026/07/01/4
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- Java / Kotlin (Maven)
- Package
org.apache.httpcomponents.core5:httpcore5- Disclosed
- 01.07.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hf6x-8p5f-cgmf - CC BY 4.0
Vulnerability history: org.apache.httpcomponents.core5:httpcore5
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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