CVE catalog

CVE-2026-67591

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 recommende

[CVE catalog]

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Aug 5, 2026, 5:38:26 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.65% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	qpid-proton	bookworm	Not reported	vulnerable
Cpe	qpid_protonj2	Not reported	`1.2.0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Cpe	qpid_protonj2	cpe	Not reported	`1.2.0`	Not reported	NVD-CVE-2026-67591	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libqpid-proton11]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2+b1 · amd64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2+b1 · arm64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[libqpid-proton11-dev]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2+b1 · amd64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2+b1 · arm64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[libqpid-proton11-dev-doc]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[libqpid-proton11-dev-examples]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[libqpid-proton-cpp12]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2+b1 · amd64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2+b1 · arm64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[libqpid-proton-cpp12-dev]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2+b1 · amd64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2+b1 · arm64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[libqpid-proton-cpp12-dev-doc]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[python3-qpid-proton]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2+b1 · amd64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2+b1 · arm64 · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
[python-qpid-proton-doc]Affected
Source package: [qpid-proton]
Details (2)
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm
- 0.37.0-2 · all · bookworm
  Affected
  nvd · qpid-proton · debian · bookworm

Observed: Oct 23, 2026, 9:52:19 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]