Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Httpclient | >= 5.4, < 5.6.4 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vqMailing ListRelease Notes
- http://www.openwall.com/lists/oss-security/2026/08/13/6Mailing ListThird Party Advisory
FAQ
What is CVE-2026-71290?
CVE-2026-71290 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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. ...
How severe is CVE-2026-71290?
CVE-2026-71290 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-71290?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Httpclient.