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Fencer Vulns
medium 6.5

CVE-2026-66275 json

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

published 2026-08-05 3 mo ago modified 2026-10-24 16 d ago also EUVD-2026-53086

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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.

Patch / fix

  • apache qpid_proton-j 0.35.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-66275 updated cvss 6.5

Apache Qpid Proton-J: Apache Qpid Proton-J: Denial of Service via exceeding session flow control window

  • Red Hat AMQ Broker 7 proton-j Red Hat build of Apache Camel 4 for Quarkus 3 proton-j Red Hat build of Apache Camel for Spring Boot 4 proton-j Red Hat build of Quarkus proton-j Red Hat Fuse 7 proton-j Red Hat JBoss Enterprise Application Platform 8 proton-j
    +1 more products
    Red Hat JBoss Enterprise Application Platform Expansion Pack proton-j
    affected: workaround, no fix available “Ensure authenticated access to AMQP endpoints is restricted to trusted clients.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Apache Software Foundation Apache Qpid Proton-J

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.