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Fencer Vulns
critical 9.1

CVE-2026-71290 json

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

published 2026-08-11 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-56973

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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.

Patch / fix

  • apache httpclient 5.6.4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-71290 updated cvss 8.1

org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification

  • Red Hat build of Apache Camel 4 for Quarkus 3 httpclient5 Red Hat build of Apicurio Registry 3 httpclient5, quarkus-apache-httpclient Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel9
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 9 jmc
    under investigation
  • Red Hat Build of Apache Camel 3.33.3.SP1 httpclient5 5.5.2.redhat-00002
    fixed: vendor fix RHSA-2026:63302
  • Red Hat Build of Debezium 3.6
    fixed: vendor fix RHSA-2026:83612
  • Red Hat build of Quarkus 3.27.5.SP1 quarkus-apache-httpclient 3.27.5.redhat-00004
    fixed: vendor fix RHSA-2026:62515
  • Red Hat OpenShift Dev Spaces 3.31 devspaces/openvsx-rhel9 1792494821, devspaces/jetbrains-ide-rhel9 1792476427, devspaces/pluginregistry-rhel9 1792495212
    fixed: vendor fix RHSA-2026:90321
  • Red Hat OpenShift Developer Tools and Services jenkins-2-plugins, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-source-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9 Red Hat Build of Apache Camel 3.33.3.SP1 jimfs 1.1, jna 5.8.0, bcel 6.7.0, gax 2.74.1, icu4j 78.2, joni 2.2.6, +1618 more Red Hat build of Apache Camel 4 for Quarkus 3 httpclient5-cache, quarkus-apache-httpclient, camel-quarkus-support-httpclient5, camel-quarkus-support-httpclient5-deployment Red Hat build of Apache Camel for Spring Boot 4 httpclient5, httpclient5-cache, httpclient5-parent Red Hat build of Quarkus 3.27.5.SP1 jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more
    +1 more products
    Red Hat OpenShift Dev Spaces 3.31 devspaces/udi-rhel9 1792708612, devspaces/code-rhel9 1792599388, devspaces/server-rhel9 1792775639, devspaces/traefik-rhel9 1792464177, devspaces/udi-base-rhel9 1792686842, devspaces/code-sshd-rhel9 1792598059, +7 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
47 d ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Apache Software Foundation Apache HttpComponents Client

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.