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CVE-2026-71290 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://www.openwall.com/lists/oss-security/2026/08/13/6	CVE	Mailing ListThird Party Advisory
https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq	[email protected]	Mailing ListRelease Notes

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-295	Improper Certificate Validation	[email protected]

Affected Products

Product	Versions
apache httpclient	>= 5.4, < 5.6.4
CPE cpe:2.3:a:apache:httpclient:::::::: Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Sep 24, 2026	CVE Modified	[email protected]
Sep 24, 2026	CVE Modified	CVE
Sep 24, 2026	CVE Modified	CISA-ADP
Aug 17, 2026	Initial Analysis	[email protected]
Aug 13, 2026	CVE Modified	CVE
Aug 13, 2026	CVE Modified	[email protected]
Aug 12, 2026	CVE Modified	CISA-ADP
Aug 11, 2026	New CVE Received	[email protected]