AIKIDO-2026-78067
httpclient5 is vulnerable to Improper Certificate Validation
91
Critical Risk
This Affects:
httpclient5TL;DR
AbstractClientTlsStrategy.upgrade copies TLS parameters onto the SSL engine before HostnameVerificationPolicy.BUILTIN sets endpoint identification, so the built-in hostname check never reaches the async handshake. An attacker who can intercept traffic can present a certificate for a different name and impersonate the server. The classic client is unaffected. The fix sets the endpoint identification algorithm before those parameters are applied.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use the async HttpClient, including the default TLS configuration.
Background info
httpclient5 is vulnerable to Improper Certificate Validation in versions 5.4 - 5.6.3.
How to fix this
Upgrade the org.apache.httpcomponents.client5:httpclient5 library to the patch version.
Links
downloads.apache.org/httpcomponents/httpclient/RELEASE_NOTES-5.6.x.txtlists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vqopenwall.com/lists/oss-security/2026/08/13/6
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