Vulnerability · Published Aug 11, 2026 · Assigned by apache
CVE-2026-71290Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)
Critical 9.1
In plain English
A critical-severity improper certificate validation in Apache HttpComponents Client 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 0.3% (higher than 26% of all known vulnerabilities).
Official description
Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. Please note the classic version of HttpClient is not affected by this vulnerability. Affected users are recommended to upgrade to at least version 5.6.4, which fixes the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | httpcomponents-core5 | no fix listed | DEBIAN-CVE-2026-71290 |
| Ubuntu:22.04:LTS | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-71290 |
| Ubuntu:24.04:LTS | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-71290 |
| Ubuntu:26.04:LTS | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-71290 |
| Ubuntu:26.10 | httpcomponents-core5 | no fix listed | UBUNTU-CVE-2026-71290 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HttpComponents Client | 5.4-alpha – through 5.6.3 |
Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N