CVE-2026-77409Network attack vector

Client disconnection via synchronous notification channel blocking

Published Sep 16, 2026 · Updated Sep 18, 2026

Denial of service in RabbitMQ amqp091-go before 1.13.0 allows remote attackers to stall AMQP clients through broker-driven events. Channel.dispatch, confirms.confirm, and Connection.dispatch0 synchronously send events to application channels, so a full or undrained listener blocks the sole frame-reading goroutine. Exploitation requires influence over broker activity or a malicious broker plus an application listener that cannot drain the burst; the resulting stall drops heartbeats and disconnects the client.

CVSS severity8.2
High
EPSS probability0.52%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in RabbitMQ amqp091-go before 1.13.0 allows remote attackers to stall AMQP clients through broker-driven events. Channel.dispatch, confirms.confirm, and Connection.dispatch0 synchronously send events to application channels, so a full or undrained listener blocks the sole frame-reading goroutine. Exploitation requires influence over broker activity or a malicious broker plus an application listener that cannot drain the burst; the resulting stall drops heartbeats and disconnects the client.

The record

CVE
CVE-2026-77409
Published
Sep 16, 2026
Updated
Sep 18, 2026
Vendor
RabbitMQ
Product
amqp091-go
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=< 1.13.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RabbitMQ · amqp091-goversion=< 1.13.0

Published CVSS scores

7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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
T1499.004Endpoint Denial of Service: Application 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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