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Vulnerability record · CVE-2026-64607 · published 31 July 2026

CVE-2026-64607: Apache httpclient vulnerability

Apache · Httpclient

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.

5.3 CVSS 3.1 Medium EPSS 0.46% · top 62.3% CWE-772 · CWE-772
5.3CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
13 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q Mailing ListRelease Notes
http://www.openwall.com/lists/oss-security/2026/08/13/5

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-64607), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.