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Advisory record · GHSA-c5pq-fr2g-9jpf

RabbitMQ amqp091-go: Protocol Desynchronization and Frame Injection via Integer Overflow in readLongstr

CVSS 9.5 CriticalCriticalEPSS 0.0052 · 44th percentile

Critical, because:

  • CVSS score 9.5: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 17 Sept 2026, 17:04 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-c5pq-fr2g-9jpf · CVE-2026-77411 · GO-2026-6496
Weakness (CWE)
CWE-754
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.

The amqp091-go library, Go package github.com/rabbitmq/amqp091-go, is vulnerable in versions before 1.13.0. When a long string inside a table field declares a length above 2^31 - 1, the parser returns an empty string without consuming the data, which desynchronizes the stream. An attacker who can send AMQP traffic to a client or server using this library could potentially inject frames and hijack the connection. Upgrade to version 1.13.0 or later. The source gives few details on exploitation conditions and does not list a workaround.

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
9.5 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 44th percentile, on 5 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.