VulnerabilityAnalyzed

CVE-2026-67591

An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service.

MEDIUM 6.5EPSS 0.42%

Does this matter?

Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own.

Description

An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service. This issue affects Apache Qpid ProtonJ2: through 1.1.0. Users are recommended to upgrade to version 1.2.0, which fixes the issue.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.42% probability · 36th percentile
CISA KEV: Not listed
Weakness: CWE-770
Affected: apache/qpid protonj2
Source: security@apache.org

References

https://lists.apache.org/thread/rwmggh2bkm6qotxpdfcplht3jgw5n036Mailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/30Mailing List, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.