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.
This page covers CVE-2026-64607 as tracked by Ubuntu, for the package commons-httpclient. No fixed version has been recorded for this distribution yet.
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
UBUNTU-CVE-2026-64607 is classified as CWE-772: Missing Release of Resource. A resource is acquired but never released on some paths, depleting the pool over time.
UBUNTU-CVE-2026-64607 is recorded against 2 packages.
Published on 31 July 2026 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
ubuntu.com (Report)
www.cve.org (Report)
lists.apache.org (Report)
commons-httpclient has other advisories on record. If you are patching this one, these are worth checking on the same host:
These advisories are the same class of weakness (CWE-772: Missing Release of Resource) in other software:
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| commons-httpclient | — | — |
| httpcomponents-client | — | — |
References
Similar Threats
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