CVE-2026-68074 in Qpid Broker-J
Summary
by MITRE • 08/05/2026
A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to 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.
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Analysis
by VulDB Data Team • 08/05/2026
The vulnerability described represents a critical resource exhaustion flaw in Apache Qpid Broker-J that operates at the pre-authentication stage, making it particularly dangerous as attackers can exploit it without requiring valid credentials. This type of vulnerability falls under the category of denial of service attacks where an adversary leverages system resources to disrupt legitimate service availability. The specific weakness manifests through unbounded symbol value caching mechanisms that fail to implement proper limits on cache growth, creating a pathway for malicious actors to consume excessive memory resources.
The technical implementation of this flaw involves the broker's handling of symbol values within its internal caching infrastructure. When processing incoming requests or messages, the system maintains cached symbol representations that are intended to improve performance through reuse of commonly encountered values. However, the absence of bounds checking on these caches allows an attacker to submit crafted inputs containing excessive or maliciously constructed symbols that accumulate in memory without restriction. This uncontrolled growth can rapidly consume available heap memory, leading to out-of-memory conditions and subsequent system instability.
From an operational perspective, the impact extends beyond simple service disruption to potentially compromising the entire messaging infrastructure. The denial of service condition affects not only the availability of the broker itself but also impacts dependent applications and services that rely on message queuing functionality. Organizations using Apache Qpid Broker-J in production environments face significant risk as this vulnerability can be exploited by anyone with network access to the affected system, making it particularly dangerous in publicly exposed deployments.
The vulnerability aligns with CWE-770, which specifically addresses allocation of resources without limits or sufficient checking, and demonstrates characteristics consistent with attack patterns documented in the ATT&CK framework under the resource exhaustion technique. This issue represents a classic example of how seemingly benign performance optimization features can become security liabilities when proper bounds checking is omitted. The recommended mitigation involves upgrading to version 10.1.0 which implements proper cache size limitations and resource management controls that prevent the unbounded accumulation of symbol values.
Security practitioners should consider implementing additional monitoring for memory usage patterns in affected systems, as this vulnerability may manifest through gradual resource consumption rather than immediate system failure. The fix in version 10.1.0 addresses the root cause by introducing proper cache eviction policies and maximum size constraints that prevent malicious inputs from causing system instability. Organizations should prioritize this upgrade across all production deployments and conduct thorough testing to ensure compatibility with existing applications while maintaining security posture against this specific denial of service vector.