Vulnerability in com.rabbitmq:amqp-client (CVE-2026-63335)
Summary
Vulnerability in com.rabbitmq:amqp-client (CVE-2026-63335). Risk of unauthorized operations or information disclosure. Exploitable via UnsupportedOperationException. Mitigation: upgrade to 5.31.0 or later.
Original description
The description as published by the source.
Summary
RabbitMQ Java Client's inbound AMQP command assembly accepts a content header declaring a small body and then processes a larger body frame by throwing a raw UnsupportedOperationException from CommandAssembler. A broker peer that the client has connected to can use this malformed frame sequence to fail frame processing and tear down the client connection instead of receiving a clean protocol-level malformed-frame error.
This was discovered based on an existing vulnerability CVE-2017-15699.
Details
Inbound frames enter the client through SocketFrameHandler.readFrame, which returns frames parsed from the peer-controlled input stream (src/main/java/com/rabbitmq/client/impl/SocketFrameHandler.java:197). AMQConnection.MainLoop reads each frame (src/main/java/com/rabbitmq/client/impl/AMQConnection.java:692) and dispatches non-zero-channel frames to the channel while the connection is open (src/main/java/com/rabbitmq/client/impl/AMQConnection.java:748 and src/main/java/com/rabbitmq/client/impl/AMQConnection.java:766). The channel then passes the frame to the current command assembler through AMQChannel.handleFrame and AMQCommand.handleFrame (src/main/java/com/rabbitmq/client/impl/AMQChannel.java:121, src/main/java/com/rabbitmq/client/impl/AMQCommand.java:114). When a content-bearing method is followed by a content header, CommandAssembler.consumeHeaderFrame records the header's declared body size in remainingBodyBytes after only checkin…
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-2026-63335 has been found in com.rabbitmq:amqp-client.
Attackers can target a specific entry point like UnsupportedOperationException over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade com.rabbitmq:amqp-client to 5.31.0 or later.
If unsure, ask your IT team or search "com.rabbitmq:amqp-client CVE-2026-63335" on the vendor's site.
CVE-2026-63335 (com.rabbitmq:amqp-client) — CWE-20
Attack surface: UnsupportedOperationException / CommandAssembler / SocketFrameHandler.readFrame / AMQConnection.MainLoop
Patched: 5.31.0 — 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-20) exists in com.rabbitmq:amqp-client. Attackers reach the vulnerable code path via UnsupportedOperationException.
Check the vendor advisory for the affected versions of com.rabbitmq:amqp-client. Attack surface: UnsupportedOperationException / CommandAssembler / SocketFrameHandler.readFrame / AMQConnection.MainLoop.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 5.31.0.
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 5.31.0ステージング環境で 5.31.0 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-2026-63335 rabbitmq-java-client
- Ubuntu UBUNTU-CVE-2026-63335 rabbitmq-java-client