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CVE-2026-79921

Vulnerability in github.com/rabbitmq/amqp091-go (CVE-2026-79921)

Summary

Vulnerability in github.com/rabbitmq/amqp091-go (CVE-2026-79921). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.13.0 or later.

Original description

The description as published by the source.

Summary
A vulnerability exists in the amqp091-go client library where a compromised or malicious AMQP broker can force the client to allocate resources for and process content body frames that exceed the negotiated frame_max limit. This can lead to unexpected memory consumption or application-layer denial of service (DoS), bypassing the protocol's built-in framing constraints.

Details
During a standard AMQP 0-9-1 connection handshake, the client and the broker negotiate a maximum frame size (frame_max), for example, 4096 bytes.

However, after negotiation, a malicious broker can send a valid basic.deliver sequence containing a content body frame whose header declares a payload size larger than the negotiated frame_max. Instead of enforcing the agreed-upon limit and closing the connection with a frame-error (as mandated by the AMQP 0-9-1 specification), the amqp091-go client:

  1. Accepts the broker-declared oversized frame size.
  2. Allocates memory based on this oversized declaration.
  3. Reads the payload, assembles it into the message, and delivers it to the consumer.

Impact

  • Denial of Service (DoS): If a broker sends extremely large frame sizes, it can trigger significant memory allocations on the client side, potentially leading to Out-Of-Memory (OOM) crashes.
  • Protocol Violation: The client fails to enforce negotiated connection parameters, trusting the broker implicitly even after constraints have been established.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-79921 has been found in github.com/rabbitmq/amqp091-go.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/rabbitmq/amqp091-go to 1.13.0 or later.
If unsure, ask your IT team or search "github.com/rabbitmq/amqp091-go CVE-2026-79921" on the vendor's site.

CVE-2026-79921 (github.com/rabbitmq/amqp091-go) — CWE-770
Patched: 1.13.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-770) exists in github.com/rabbitmq/amqp091-go.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/rabbitmq/amqp091-go.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 1.13.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/rabbitmq/amqp091-go' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/rabbitmq/amqp091-go' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/rabbitmq/amqp091-go を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/rabbitmq/amqp091-go to 1.13.0

    ステージング環境で 1.13.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

go github.com/rabbitmq/amqp091-go
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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