CVE-2026-64607Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS
Updated under an hour ago ()
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It affects Apache Software Foundation Apache HttpComponents Client and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-772
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- apache
- NVD analysis
- Modified
- Record last updated
- Aug 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Software Foundation Apache HttpComponents Client apache_software_foundation:apache_httpcomponents_client (from the name) | from 5.0-alpha through 5.6.2 | CNA record |
apache httpclient apache:httpclient | from 5.0.0 before 5.6.3 | NVD |
References
- https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511qvendor-advisory, mailing-list, release-notes
- http://www.openwall.com/lists/oss-security/2026/08/13/5
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.