Vulnerability in com.rabbitmq:amqp-client (CVE-2026-63337)
Summary
Vulnerability in com.rabbitmq:amqp-client (CVE-2026-63337). Risk of unauthorized operations or information disclosure. Exploitable via JsonRpcClient. Mitigation: upgrade to 5.33.0 or later.
Original description
The description as published by the source.
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, com.rabbitmq.tools.jsonrpc.ProcedureDescription receives a javaReturnType value in an untrusted system.describe response and passes it through JSONUtil.tryFill, setJavaReturnType, and computeReturnTypeAsJavaClass to Class.forName(javaReturnType) with initialization enabled. An attacker able to answer the JsonRpcClient request through a shared broker or network interception can select a class already present in the victim JVM and trigger its static initializer, while JsonRpcClient.java later passes getReturnType output to mapper.parse and may also create type confusion. Successful exploitation can affect confidentiality, integrity, and availability in the client process. This issue is fixed in version 5.33.0.
Source: GitHub Security Advisories (Global) 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-2026-63337 has been found in com.rabbitmq:amqp-client.
Attackers can target a specific entry point like JsonRpcClient over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade com.rabbitmq:amqp-client to 5.33.0 or later.
If unsure, ask your IT team or search "com.rabbitmq:amqp-client CVE-2026-63337" on the vendor's site.
CVE-2026-63337 (com.rabbitmq:amqp-client) — CWE-470
Attack surface: JsonRpcClient / system.describe / javaReturnType
Patched: 5.33.0 — 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.
A vulnerability (CWE-470) exists in com.rabbitmq:amqp-client. Attackers reach the vulnerable code path via JsonRpcClient.
Check the vendor advisory for the affected versions of com.rabbitmq:amqp-client. Attack surface: JsonRpcClient / system.describe / javaReturnType.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 5.33.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで com.rabbitmq:amqp-client を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade com.rabbitmq:amqp-client to 5.33.0ステージング環境で 5.33.0 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。
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3Post-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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-63337 rabbitmq-java-client
- Ubuntu UBUNTU-CVE-2026-63337 rabbitmq-java-client
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- patch github.com
- patch github.com
- patch github.com
- web github.com
- web github.com