RabbitMQ amqp091-go: Resource Exhaustion (OOM) via Unbounded Body Buffer Allocation

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.9 · 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 · score source

EPSS

• CVE-2026-77410: 0.52% estimated exploitation activity in the next 30 days; percentile 44.47 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A flaw in the recvContent function allows a malicious AMQP server to trigger an Out-of-Memory (OOM) error, forcing the host operating system or container runtime to immediately terminate the client process. Vulnerability Details When receiving message content payloads, the client processes the expected size from the content header framework. The recvContent function attempts to optimize performance by pre-allocating memory for the message body based on the ch.header.Size field, which is a 64-bit unsigned integer (uint64). The underlying library fails to validate or cap this requested size against any upper boundary—such as the maximum frame size negotiated during connection establishment (FrameMax). If a server specifies an extreme body size (e.g., 2^62 bytes), the Go runtime attempts to allocate an exabyte-scale slice capacity. This immediately exhausts available system memory, causing the operating system's OOM killer to terminate the application. Attack Vector /…

Published by the source

17 Sep 2026, 17:04 UTC

Last modified by the source

1 Oct 2026, 20:45 UTC

Source last checked

26 Oct 2026, 15:29 UTC

1. Revision 4 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-r9c8-gcjp-xfwh

2. Revision 3 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6500

4. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-r9c8-gcjp-xfwh

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# Patch Next advisory brief: CVE-2026-77410

Advisory: RabbitMQ amqp091-go: Resource Exhaustion (OOM) via Unbounded Body Buffer Allocation
IDs: CVE-2026-77410, GHSA-r9c8-gcjp-xfwh
Record: https://patchnext.com/advisories/cve-2026-77410 (revision 4, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/rabbitmq/amqp091-go 1.13.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/rabbitmq/amqp091-go: affected < 1.13.0; fixed in 1.13.0

## Suggested inspection (read-only)
- Go github.com/rabbitmq/amqp091-go: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/rabbitmq/amqp091-go.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-r9c8-gcjp-xfwh (OSV record GHSA-r9c8-gcjp-xfwh lists affected ranges: Go github.com/rabbitmq/amqp091-go >=0 <1.13.0 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6500 (OSV record GO-2026-6500 lists affected ranges: Go github.com/rabbitmq/amqp091-go >=0 <1.13.0 (fixed))
- Verified: https://github.com/advisories/GHSA-r9c8-gcjp-xfwh (GitHub-reviewed advisory GHSA-r9c8-gcjp-xfwh lists affected ranges: Go github.com/rabbitmq/amqp091-go >=0 <1.13.0)

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