CWE-1322Base

Use of Blocking Code in Single-threaded, Non-blocking Context

Incomplete in the CWE catalog · 3 CVEs mapped

3
CVEs mapped
6.0
Median CVSS
What it is

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.

Recent examples
7.5cvss
CVE-2026-19484

CVE-2026-19484 - HIGH Severity Vulnerability

@fastify/busboy is a multipart form-data parser. In versions 3.1.0 through 3.2.0, a remote unauthenticated attacker can stall the Node.js event loop by sending a multipart request whose boundary is crafted to a specific length. The vendored streaming search stores its skip table in a fixed 256 entry byte array, and a boundary of exactly 252 bytes makes the search needle 256 bytes, which truncates the default skip distance to zero and turns the search into a CPU bound loop on a small body. A single small request can keep one core busy and deny service to other requests handled by the same process. The issue is fixed in @fastify/busboy 3.2.1, which widens the skip table so the skip distance is preserved. Users should upgrade to 3.2.1.

HIGHno explanation yet
0%
epss
none
CVE-2026-71439

CVE-2026-71439 - UNKNOWN Severity Vulnerability

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

no explanation yet
0%
epss
6.0cvss
CVE-2026-42256

net-imap: Denial of service via high iteration count for `SCRAM-*` authentication

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 a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

MEDIUMno explanation yet
0%
epss
The record
Technical detail
CWE ID
CWE-1322
Abstraction
Base
Structure
Simple
Status
Incomplete