# CVE-2026-64607

## Summary

- **CVE ID:** CVE-2026-64607
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
- **CWE:** CWE-772
- **Published:** Jul 31, 2026
- **Last Modified:** Aug 13, 2026

## 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 Products

- Apache Software Foundation — Apache HttpComponents Client (5.0-alpha)

## References

- [CNA](https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q)
- [CVE](http://www.openwall.com/lists/oss-security/2026/08/13/5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.48%
- **EPSS Percentile:** 40.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._