9.1Critical
CVE-2026-71290Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)
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.
Weakness (CWE):
CWE-295
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| Apache Software Foundation | Apache HttpComponents Client | 5.4-alpha – ≤ 5.6.3 | |
| apache | httpclient | 5.4 – < 5.6.4 |
References and patches
- https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq vendor-advisoryMailing ListRelease Notes
- http://www.openwall.com/lists/oss-security/2026/08/13/6 Mailing ListThird Party Advisory
CPE matches (NVD) (1)
cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*≥ 5.4 < 5.6.4