CVE-2026-67590Network attack vector

Pre-authentication service interruption via recursive type decoding

Published Aug 5, 2026 · Updated Aug 5, 2026

Uncontrolled recursion in Apache Qpid ProtonJ2 1.1.0 and earlier allows remote attackers to interrupt AMQP services before authentication. The AMQP type decoder recursively processes attacker-controlled nested type values without enforcing a nesting-depth limit until the Java call stack is exhausted. Exposure requires a network-reachable application that passes untrusted AMQP input to the library; successful triggering raises StackOverflowError and interrupts processing.

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

What happened

Uncontrolled recursion in Apache Qpid ProtonJ2 1.1.0 and earlier allows remote attackers to interrupt AMQP services before authentication. The AMQP type decoder recursively processes attacker-controlled nested type values without enforcing a nesting-depth limit until the Java call stack is exhausted. Exposure requires a network-reachable application that passes untrusted AMQP input to the library; successful triggering raises StackOverflowError and interrupts processing.

The record

CVE
CVE-2026-67590
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Apache Software Foundation
Product
Apache Qpid ProtonJ2
Classifications
CWE-674, 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

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Is a vulnerable build present?

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  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

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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