Medium 6.5Published Aug 5, 2026

CVE-2026-66275Apache Qpid Proton-J: Incoming session flow control window can be exceeded

Updated under an hour ago (2026-10-19 08:23 UTC)

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It affects Apache Software Foundation Apache Qpid Proton-J 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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Every CVE for Apache Software Foundation Apache Qpid Proton-J

Exploited in the last 30 days

An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service. This issue affects Apache Qpid Proton-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.

CVSS: 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
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: Analyzed
Record last updated: Aug 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache Qpid Proton-J apache_software_foundation:apache_qpid_proton_j (from the name)	through 0.34.1	CNA record
apache qpid_proton-j apache:qpid_proton-j	before 0.35.0	NVD

References

https://lists.apache.org/thread/jds59nxrgcxtlx7xl0kvl5hqt07thxztvendor-advisory
http://www.openwall.com/lists/oss-security/2026/08/04/11third-party-advisory

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.