CVE-2026-67552Network attack vector

Pre-authentication service interruption via unbounded type nesting

Published Aug 5, 2026 · Updated Aug 5, 2026

Uncontrolled recursion in Apache Qpid Proton DotNet 1.0.0 and earlier allows remote attackers to interrupt AMQP services via nested types. The published advisory identifies unbounded type nesting but does not disclose the decoding function or exact recursive code path that exhausts the .NET call stack. The input is accepted before authentication, and no user interaction is required to trigger the StackOverflowError.

CVSS severity7.5
High
EPSS probability0.48%
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 Proton DotNet 1.0.0 and earlier allows remote attackers to interrupt AMQP services via nested types. The published advisory identifies unbounded type nesting but does not disclose the decoding function or exact recursive code path that exhausts the .NET call stack. The input is accepted before authentication, and no user interaction is required to trigger the StackOverflowError.

The record

CVE
CVE-2026-67552
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Apache Software Foundation
Product
Apache Qpid Proton DotNet
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?

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

  1. Affected versionversion=0 <=1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Qpid Proton DotNetversion=0 <=1.0.0

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.

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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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