CWE-1322 – Use of Blocking Code in Single-threaded, Non-blocking Context | Common Weakness Enumeration (CWE)

Overview

CWE-1322 (Use of Blocking Code in Single-threaded, Non-blocking Context) documents a weakness type used across vulnerability databases and security assessments. Use the sections below for definition, context, and mapped CVEs.

Security impact: Security impact: Depends on product and context; use CVE records, severity scores, and MITRE guidance to prioritize.

Description

The product uses a non-blocking model that relies on a single threaded process for features such as scalability, but it contains code that can block when it is invoked.

Applicable platforms

Kind	Name	Class	Prevalence	OS / CPE
language	—	Not Language-Specific	Undetermined	—

Related CVEs in this database

These CVEs are mapped to this weakness in this database and kept for traceability and search.

CVE	Published	Summary
CVE-2026-42256	2026-05-09	Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating …

Content submission

Name: Joe Harvey
Date: 2019-10-25
Version: 4.3

Content modifications

Date	Name	Version	Importance	Comment
2023-04-27	CWE Content Team	4.11	—	updated Relationships
2023-06-29	CWE Content Team	4.12	—	updated Mapping_Notes
2025-12-11	CWE Content Team	4.19	—	updated Applicable_Platforms, Weakness_Ordinalities