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Advisory record · GHSA-xwwf-m8fg-p9q2

RabbitMQ amqp091-go: Denial of Service via Sub-Spec Frame Size Negotiation

CVSS 8.9 HighEPSS 0.0052 · 44th percentile

Published by the GitHub Advisory Database at 17 Sept 2026, 17:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/rabbitmq/amqp091-goGo<1.13.01.13.0
Identifiers
GHSA-xwwf-m8fg-p9q2 · CVE-2026-77403 · GO-2026-6503
Weakness (CWE)
CWE-770
Tags
Published
17 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

GHSA-xwwf-m8fg-p9q2: the Go package github.com/rabbitmq/amqp091-go before 1.13.0 does not enforce the AMQP minimum frame size of 4096 bytes during connection negotiation, so it accepts a server-advertised FrameMax as low as 1 byte. An attacker who controls or intercepts the broker a client connects to can force every message to be split into tiny frames, exhausting CPU and freezing the application. Upgrade to version 1.13.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.9 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 44th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.