CWE-1096: Singleton Class Instance Creation without Proper Locking or Synchronization
The product implements a Singleton design pattern but does not use appropriate locking or other synchronization mechanism to ensure that the singleton class is only instantiated once.
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Overview
CWE-1096 (Singleton Class Instance Creation without Proper Locking or Synchronization) is a variant-level software weakness catalogued by MITRE in the Common Weakness Enumeration (CWE). It describes a recurring type of mistake that can lead to exploitable security vulnerabilities.
Common consequences
What can happen when CWE-1096 is exploited.
Reduce Reliability
Affects: Other
This issue can prevent the product from running reliably, e.g. by making the instantiation process non-thread-safe and introducing deadlock (CWE-833) or livelock conditions. If the relevant code is reachable by an attacker, then this reliability problem might introduce a vulnerability.
How it happens
When it is introduced
Typically introduced during these phases of the software lifecycle.