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CVE-2026-71290

Apache Httpclient vulnerability

9.1 CRITICALEPSS 0.33%
  1. Published11 Aug 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Httpclient≥ 5.4 < 5.6.4

Remediation

Fixed in
Apache Httpclient≥ 5.6.4

References

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Frequently asked

Is CVE-2026-71290 being actively exploited?

CVE-2026-71290 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.33%.

How severe is CVE-2026-71290?

CVE-2026-71290 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.33% probability of exploitation.

Which products are affected by CVE-2026-71290?

Affected products include Apache Httpclient.

How do I fix CVE-2026-71290?

Upgrade affected software to a fixed version, for example Apache Httpclient 5.6.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-71290 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.