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Vulnerability · Published Jul 31, 2026 · Assigned by apache

CVE-2026-64607Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS

Medium 5.3

In plain English

A medium-severity security flaw in Apache HttpComponents Client from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 59.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12commons-httpclientno fix listedDEBIAN-CVE-2026-64607
Debian:13commons-httpclientno fix listedDEBIAN-CVE-2026-64607
Debian:14commons-httpclientno fix listedDEBIAN-CVE-2026-64607
Debian:12httpcomponents-clientno fix listedDEBIAN-CVE-2026-64607
Debian:13httpcomponents-clientno fix listedDEBIAN-CVE-2026-64607
Debian:14httpcomponents-clientno fix listedDEBIAN-CVE-2026-64607
Mavenorg.apache.httpcomponents.client5:httpclient55.6.3GHSA-hjcp-jmpx-g3qm
Ubuntu:22.04:LTScommons-httpclientno fix listedUBUNTU-CVE-2026-64607
Ubuntu:24.04:LTScommons-httpclientno fix listedUBUNTU-CVE-2026-64607
Ubuntu:26.04:LTScommons-httpclientno fix listedUBUNTU-CVE-2026-64607
Ubuntu:26.10commons-httpclientno fix listedUBUNTU-CVE-2026-64607
Ubuntu:22.04:LTShttpcomponents-clientno fix listedUBUNTU-CVE-2026-64607
Ubuntu:24.04:LTShttpcomponents-clientno fix listedUBUNTU-CVE-2026-64607
Ubuntu:26.04:LTShttpcomponents-clientno fix listedUBUNTU-CVE-2026-64607
Ubuntu:26.10httpcomponents-clientno fix listedUBUNTU-CVE-2026-64607

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache HttpComponents Client 5.0-alpha – through 5.6.2

Weakness: CWE-772 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References