Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM) (CVE-2026-71290) | HOL Guard CVE

Critical · CVSS 9.1CVE-2026-71290

Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)

Answer in brief

CVE-2026-71290 records a Critical severity (CVSS 9.1) vulnerability in Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM). The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache HttpComponents Client (generic), Apache Software Foundation/org.apache.httpcomponents.client5:httpclient5 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 11, 2026Updated Sep 24, 2026Source checked Sep 26, 2026First seen by HOL Aug 11, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.1
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache HttpComponents Client (generic), Apache Software Foundation/org.apache.httpcomponents.client5:httpclient5 (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:apache:httpclient::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/Apache HttpComponents Clientgeneric	5.4-alpha	Not reported
Apache Software Foundation/org.apache.httpcomponents.client5:httpclient5generic	>=5.4-alpha <=5.6.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache HttpComponents Client, Apache Software Foundation/org.apache.httpcomponents.client5:httpclient5.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.