CVE-2026-67589Network attack vector

Service interruption via excessive type allocation

Published Aug 5, 2026 · Updated Aug 5, 2026

Excessive allocation in Apache Qpid ProtonJ2 1.1.0 and earlier allows remote attackers to interrupt dependent services before authentication. Apache has disclosed only that AMQP type size/count handling permits excessive allocation; it has not identified the affected decoder or operation. Exploitation requires an application to expose ProtonJ2 parsing to an untrusted AMQP peer, and memory exhaustion can halt that application.

CVSS severity7.5
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Excessive allocation in Apache Qpid ProtonJ2 1.1.0 and earlier allows remote attackers to interrupt dependent services before authentication. Apache has disclosed only that AMQP type size/count handling permits excessive allocation; it has not identified the affected decoder or operation. Exploitation requires an application to expose ProtonJ2 parsing to an untrusted AMQP peer, and memory exhaustion can halt that application.

The record

CVE
CVE-2026-67589
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Apache Software Foundation
Product
Apache Qpid ProtonJ2
Classifications
CWE-789, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Qpid ProtonJ2version=0 <=1.1.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo