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

Quick assessment

Affected
Apache Software Foundation Apache HttpComponents Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache HttpComponents Client是美国Apache基金会的一款实现HTTP协议通信的客户端库。 Apache HttpComponents Client 5.0-alpha1版本至5.6.2版本存在资源管理错误漏洞，该漏洞源于遇到无效或不支持的Content-Encoding标头值时，基于经典I/O模型的HttpClient未能正确释放底层连接。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.48% · P41

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache HttpComponents Client 5.0-alpha≤ 5.6.2 affected
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I. Basic Information for CVE-2026-64607

Vulnerability Information
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Vulnerability Title
Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HttpComponents Client 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HttpComponents Client是美国Apache基金会的一款实现HTTP协议通信的客户端库。 Apache HttpComponents Client 5.0-alpha1版本至5.6.2版本存在资源管理错误漏洞，该漏洞源于遇到无效或不支持的Content-Encoding标头值时，基于经典I/O模型的HttpClient未能正确释放底层连接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache HttpComponents Client 5.0-alpha ~ 5.6.2 -

II. Public POCs for CVE-2026-64607

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III. Intelligence Information for CVE-2026-64607

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Mailing List Discussions for CVE-2026-64607 (1)

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IV. Related Vulnerabilities

Same product: Apache HttpComponents Client
Same vendor: Apache Software Foundation
Same weakness: CWE-772

V. Comments for CVE-2026-64607

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