8.9

CVE-2026-77403: rabbitmq amqp091-go

CVSS: 8.9v4.0HighAwaiting analysis
AliasesUBUNTU-CVE-2026-77403DEBIAN-CVE-2026-77403GHSA-xwwf-m8fg-p9q2
Published 16-09-2026Last modified 16-09-2026
Open JSON

Vulnerability summary

CVE-2026-77403 is a high (CVSS 8.9) vulnerability in rabbitmq amqp091-go. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43.2% of scored vulnerabilities.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.9/10
010
High · v4.0 (CVE.org)
EPSS score
0.52%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:68290

Timeline

  1. 16-09-2026
    PublishedVulnerability first disclosed.
  2. 16-09-2026
    Last modifiedVulnerability information updated.

Description

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Connection.openTune in connection.go accepts a server-advertised FrameMax below the AMQP frameMinSize value of 4096 bytes because the connection negotiation loop does not enforce the protocol minimum. A malicious or compromised AMQP broker can therefore advertise an extremely small FrameMax, causing later client publications to be fragmented into excessive numbers of frames and write operations. This can consume CPU and stall the client or its host. This issue is fixed in version 1.13.0.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

+0.11 pp

From 0.41% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • golang-github-rabbitmq-amqp091-goAll versions (No fix recorded) | < 1.14.0-1
Github.com/rabbitmq1 product
  • amqp091-go< 1.13.0
Rabbitmq1 product
Ubuntu1 product
  • golang-github-rabbitmq-amqp091-goAll versions (No fix recorded)

4 vendors · 4 products

References

9 links