CVE-2026-66277Network attack vector

Authenticated service interruption via unbounded transfer frames

Published Aug 5, 2026 · Updated Aug 5, 2026

Resource exhaustion in Apache Qpid Proton-J 0 through 0.34.1 allows remote authenticated users to interrupt AMQP services. The incoming-delivery path accepts an unbounded number of transfer frames for one delivery and retains associated state without a governing limit. An authenticated AMQP peer can keep a delivery open with excessive frames, consuming resources until the embedding broker, client, router, bridge, or proxy becomes unavailable.

CVSS severity6.5
Medium
EPSS probability0.42%
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 Qpid Proton-J 0 through 0.34.1 allows remote authenticated users to interrupt AMQP services. The incoming-delivery path accepts an unbounded number of transfer frames for one delivery and retains associated state without a governing limit. An authenticated AMQP peer can keep a delivery open with excessive frames, consuming resources until the embedding broker, client, router, bridge, or proxy becomes unavailable.

The record

CVE
CVE-2026-66277
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Apache Software Foundation
Product
Apache Qpid Proton-J
Classifications
CWE-770, T1499
Attack vector
network
Privileges
authenticated

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 <=0.34.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Qpid Proton-Jversion=0 <=0.34.1

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5Red HatCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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