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Fencer Intel
medium 5.3

CVE-2026-64607 json

Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS

published 3mo ago modified 19d ago also EUVD-2026-51519 , GHSA-hjcp-jmpx-g3qm

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported `Content-Encoding` header value in the response message. Please note this defect does not affect HttpClient based on the async i/o model.

This issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2.

Patch / fix

  • maven org.apache.httpcomponents.client5:httpclient5 5.6.3
  • org.apache.httpcomponents.client5 httpclient5 5.6.3
  • httpcomponents-client SLE Module for Development Tools 15 SP7 4.5.14-150200.3.12.1

suse advisories SUSE-SU-2026:4028-1

  • httpcomponents-client openSUSE Leap 16.0 4.5.14-160000.4.1
  • httpcomponents-client openSUSE Tumbleweed 4.5.14-2.1

opensuse advisories openSUSE-SU-2026:21894-1openSUSE-SU-2026:11647-1

Is CVE-2026-64607 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2026-64607 updated cvss 7.5

org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Denial of Service due to connection leak

  • 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 4 for Quarkus 3 httpclient5 Red Hat build of Apicurio Registry 3 httpclient5, quarkus-apache-httpclient Red Hat build of Debezium 3 httpclient5
    affected: workaround, no fix available
  • Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4/jenkins-rhel8 1786628667
    fixed: vendor fix RHSA-2026:60247
  • Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4/jenkins-rhel8 1786628681
    fixed: vendor fix RHSA-2026:60249
  • Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4/jenkins-rhel8 1786533561
    fixed: vendor fix RHSA-2026:60248
  • Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4/jenkins-rhel8 1786533565
    fixed: vendor fix RHSA-2026:60239
  • Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4/jenkins-rhel9 1787125166
    fixed: vendor fix RHSA-2026:60251
  • Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4/jenkins-rhel9 1787124635
    fixed: vendor fix RHSA-2026:60246
  • Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4/jenkins-rhel9 1787125069
    fixed: vendor fix RHSA-2026:60250
show 12 more
  • Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4/jenkins-rhel9 1787124632
    fixed: vendor fix RHSA-2026:60252
  • Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4/jenkins-rhel9 1787124925
    fixed: vendor fix RHSA-2026:60259
  • Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4/jenkins-rhel9 1787125311
    fixed: vendor fix RHSA-2026:60254
  • Red Hat OpenShift Developer Tools and Services 4.22 ocp-tools-4/jenkins-rhel9 1787124779
    fixed: vendor fix RHSA-2026:60256
  • 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 Apache Camel 4.18.4 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:71675
  • 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/pluginregistry-rhel9 1792495212
    fixed: vendor fix RHSA-2026:90321
  • Red Hat OpenShift Developer Tools and Services jenkins-2-plugins Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4/jenkins-agent-base-rhel8 1786628706 Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4/jenkins-agent-base-rhel8 1786628711 Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4/jenkins-agent-base-rhel8 1786628748 Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4/jenkins-agent-base-rhel8 1786628726 Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4/jenkins-agent-base-rhel9 1787124634
    +9 more products
    Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4/jenkins-agent-base-rhel9 1787124986 Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4/jenkins-agent-base-rhel9 1787124633 Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4/jenkins-agent-base-rhel9 1787124663 Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4/jenkins-agent-base-rhel9 1787125493 Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4/jenkins-agent-base-rhel9 1787125679 Red Hat OpenShift Developer Tools and Services 4.22 ocp-tools-4/jenkins-agent-base-rhel9 1787125563 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 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
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 9 jmc
    not affected: component not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel9 Red Hat OpenShift Dev Spaces devspaces/jetbrains-ide-rhel9 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, +8 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
partial
Assessed
3mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
maven org.apache.httpcomponents.client5:httpclient5
>=5.0-alpha1, <5.6.3
5.6.3

Affected products

  • Apache Software Foundation Apache HttpComponents Client

Classification

Weakness
  • CWE-772 Missing Release of Resource after Effective Lifetime

References

Sources

Fencer Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.