CWE-1096: Singleton Class Instance Creation without Proper Locking or Synchronization

VariantIncomplete

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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Technical Details

Structure
Simple
Vulnerability Mapping
ALLOWED

Applicable To

Languages
Not Language-Specific
Platforms

Source-backed guidance

Additional facts reviewed against primary or authoritative security sources.

Detect imprecise mappings involving CWE-1096

Review mappings to CWE-1096, Singleton Class Instance Creation without Proper Locking or Synchronization, with MITRE's mapping and navigation criteria. Flag any selection that points to a View or Category, remains at a higher abstraction than the available evidence supports, or ignores relevant parent, child, peer, and alternative entries. Treat those findings as mapping-quality defects, correct them before publication, and retain the comparison trail for repeatable audits.

CWE Mapping and Navigation Guidance — MITRE CWE

Prevent CWE-1096 through an SSDF control plan

Use NIST SSDF practices to make prevention of CWE-1096, Singleton Class Instance Creation without Proper Locking or Synchronization, an explicit development outcome. Translate the CWE definition into security requirements and design constraints, choose safer implementation patterns and toolchain checks, and define acceptance evidence before release. Feed every confirmed occurrence back into the requirements, design review, and coding rules so the same root cause is removed across the product rather than patched in one location.

NIST SP 800-218 Secure Software Development Framework — National Institute of Standards and Technology

Triage CWE-1096 against known exploitation evidence

Use CISA's Known Exploited Vulnerabilities catalog to test whether a vulnerability mapped to CWE-1096, Singleton Class Instance Creation without Proper Locking or Synchronization, has evidence of exploitation in the wild. Confirm the CVE-to-CWE root-cause mapping independently before attaching the example, then capture the affected product, required action, and remediation deadline. A missing KEV match is not evidence that the weakness is unexploited, and a KEV entry must not be generalized to every occurrence of this CWE.

Known Exploited Vulnerabilities Catalog — Cybersecurity and Infrastructure Security Agency

Validate CWE-1096 with root-cause mapping checks

Apply MITRE's root-cause mapping quick tips to CWE-1096, Singleton Class Instance Creation without Proper Locking or Synchronization. Confirm the finding describes the causal weakness rather than an impact or attack pattern, compare the abstraction and mapping notes with plausible alternatives, and have a second reviewer challenge the selection. Preserve the evidence and reasoning so recurring defects can be measured against one consistent identifier.

CVE to CWE Root Cause Mapping Quick Tips — MITRE CWE

Frequently Asked Questions

What is CWE-1096: Singleton Class Instance Creation without Proper Locking or Synchronization?+

CWE-1096: Singleton Class Instance Creation without Proper Locking or Synchronization is a Common Weakness Enumeration (CWE) entry maintained by MITRE. 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.

What are the security consequences of Singleton Class Instance Creation without Proper Locking or Synchronization?+

If exploited, CWE-1096 (Singleton Class Instance Creation without Proper Locking or Synchronization) it can compromise Other, leading to outcomes such as Reduce Reliability.

Which programming languages are affected by Singleton Class Instance Creation without Proper Locking or Synchronization?+

CWE-1096 commonly affects Not Language-Specific. Note that weaknesses are often language-agnostic patterns, so secure coding practices apply broadly.

What is the difference between a CWE and a CVE?+

A CWE (Common Weakness Enumeration) like CWE-1096 describes a category of software weakness — the underlying flaw type. A CVE (Common Vulnerabilities and Exposures) identifies a specific, real-world vulnerability in a particular product. In short, a CWE is the kind of mistake, and a CVE is an instance of that mistake being found in software.

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