5.3Medium
CVE-2026-64607Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS
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.
Weakness (CWE):
CWE-772
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| Apache Software Foundation | Apache HttpComponents Client | 5.0-alpha – ≤ 5.6.2 | |
| apache | httpclient | 5.0.0 – < 5.6.3 |
References and patches
- https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q vendor-advisoryMailing ListRelease Notes
- http://www.openwall.com/lists/oss-security/2026/08/13/5
CPE matches (NVD) (1)
cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*≥ 5.0.0 < 5.6.3