Vulnerability · Published Jul 1, 2026 · Assigned by apache
CVE-2026-54399Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration
High 7.5
In plain English
A high-severity uncontrolled resource consumption in Apache HttpComponents Core from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | httpcomponents-core | no fix listed | DEBIAN-CVE-2026-54399 |
| Debian:13 | httpcomponents-core | no fix listed | DEBIAN-CVE-2026-54399 |
| Debian:14 | httpcomponents-core | no fix listed | DEBIAN-CVE-2026-54399 |
| Debian:12 | httpcomponents-core5 | no fix listed | DEBIAN-CVE-2026-54399 |
| Debian:13 | httpcomponents-core5 | no fix listed | DEBIAN-CVE-2026-54399 |
| Debian:14 | httpcomponents-core5 | 5.4.3-1 | DEBIAN-CVE-2026-54399 |
| Maven | org.apache.httpcomponents.core5:httpcore5 | 5.5-beta2 | GHSA-hf6x-8p5f-cgmf |
| Maven | org.apache.httpcomponents.core5:httpcore5 | 5.4.3 | GHSA-hf6x-8p5f-cgmf |
| Ubuntu:22.04:LTS | httpcomponents-core | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:24.04:LTS | httpcomponents-core | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:25.10 | httpcomponents-core | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:26.04:LTS | httpcomponents-core | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:26.10 | httpcomponents-core | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:22.04:LTS | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:24.04:LTS | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:25.10 | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:26.04:LTS | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-54399 |
| Ubuntu:26.10 | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-54399 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HttpComponents Core | 5.5-alpha – through 5.5-beta15.0-alpha – through 5.4.2 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H