CVE-2026-67465Network attack vector

Pre-authentication denial of service via unbounded symbol cache

Published Aug 5, 2026 · Updated Aug 5, 2026

Resource exhaustion in Apache Software Foundation Apache Qpid Proton DotNet 1.0.0 and earlier allows remote attackers to interrupt AMQP services. The protocol engine retains attacker-supplied Symbol values in an unbounded cache, so distinct pre-authentication values consume memory continuously. Network reachability to an application accepting AMQP input through the library is required; exhaustion interrupts that application without reported data disclosure or modification.

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

Resource exhaustion in Apache Software Foundation Apache Qpid Proton DotNet 1.0.0 and earlier allows remote attackers to interrupt AMQP services. The protocol engine retains attacker-supplied Symbol values in an unbounded cache, so distinct pre-authentication values consume memory continuously. Network reachability to an application accepting AMQP input through the library is required; exhaustion interrupts that application without reported data disclosure or modification.

The record

CVE
CVE-2026-67465
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Apache Software Foundation
Product
Apache Qpid Proton DotNet
Classifications
CWE-770, 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-770Allocation of Resources Without Limits or Throttling
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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