Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Pre-auth network path with no complexity; only availability impact via unbounded allocation; no scope change, confidentiality, or integrity effect.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
6DescriptionCVE.org
A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service.
This issue affects Apache Qpid Broker-J: through 10.0.1.
Users are recommended to upgrade to version 10.1.0, which fixes the issue.
AnalysisAI
Unauthenticated denial-of-service in Apache Qpid Broker-J through 10.0.1 allows any network-reachable attacker to crash or hang the broker by sending crafted AMQP protocol messages that exploit improper type size/count validation, triggering unbounded memory allocation. The flaw resides in the pre-authentication protocol parsing path, requiring no credentials, user interaction, or special configuration. No active exploitation is confirmed by CISA KEV, and the EPSS score of 0.19% (9th percentile) indicates minimal observed exploitation activity despite the straightforward attack vector.
Technical ContextAI
Apache Qpid Broker-J is a Java-based AMQP 1.0 message broker developed under the Apache Software Foundation, commonly used in enterprise messaging architectures. The affected CPE is cpe:2.3:a:apache_software_foundation:apache_qpid_broker-j:*:*:*:*:*:*:*:*, covering all releases from the initial version through 10.0.1. The root cause is classified as CWE-770 (Allocation of Resources Without Limits or Throttling): the broker fails to bound or validate type size and count fields received during AMQP framing before performing memory allocation, meaning a maliciously constructed value can instruct the broker to allocate arbitrarily large memory regions. Because this occurs in the pre-authentication code path - before any credential verification - the full attack surface is exposed to any host that can reach the broker's AMQP listening port.
RemediationAI
Upgrade Apache Qpid Broker-J to version 10.1.0, which contains the official fix per the Apache advisory at https://lists.apache.org/thread/0slvl8h25w3z4opnh08yyn8l3chko5c9. If an immediate upgrade is operationally infeasible, restrict inbound access to the AMQP listening ports (typically TCP 5672 for unencrypted and TCP 5671 for TLS) at the network perimeter or host firewall to only known, trusted client IP ranges; this reduces the attack surface to adversaries who have already gained network adjacency and does not eliminate the vulnerability, but prevents unauthenticated external exploitation. Enabling mutual TLS authentication at the broker boundary is an additional layer that forces clients to present valid certificates before protocol framing begins, though this requires certificate infrastructure and may impact existing clients. No other workarounds are documented in available advisories.
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-53056
GHSA-x379-jmr7-h8qf