Common Weakness Enumeration

CWE-1322

Allowed

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

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

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.

4 vulnerabilities reference this CWE, most recent first.

CVE-2026-89329 (GCVE-0-2026-89329)

Vulnerability from cvelistv5 – Published: 2026-09-11 18:42 – Updated: 2026-11-06 01:14
VLAI
Title
Device-mapper-multipath: local denial of service via blocking ipc send operations
Summary
A flaw was found in `multipathd`. A local attacker with access to the `multipathd` UNIX control socket can exploit this vulnerability by sending valid commands and then ceasing to read replies. This action can cause the `multipathd` listener thread to block, leading to a Denial of Service (DoS) where legitimate Inter-Process Communication (IPC) operations may hang or time out. This issue does not result in privilege escalation, arbitrary code execution, or impact data confidentiality or integrity.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 19:35 UTC
CWE
  • CWE-1322 - Use of Blocking Code in Single-threaded, Non-blocking Context
Assigner
redhat CNA
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-89329 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2470013 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-09-11 15:10
Credits
This issue was discovered by Found by AISLE in partnership with Red Hat.
Show details on NVD website
To clipboard 

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CVE-2026-71439 (GCVE-0-2026-71439)

Vulnerability from cvelistv5 – Published: 2026-08-06 20:01 – Updated: 2026-08-07 17:09
VLAI
Title
Mermaid radar diagrams are vulnerable to DoS
Summary
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.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-07 15:26 UTC
CWE
  • CWE-606 - Unchecked Input for Loop Condition
  • CWE-1322 - Use of Blocking Code in Single-threaded, Non-blocking Context
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
mermaid-js mermaid Affected: >= 11.6.0, < 11.16.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-42256 (GCVE-0-2026-42256)

Vulnerability from cvelistv5 – Published: 2026-05-09 19:38 – Updated: 2026-05-11 17:04
VLAI
Title
net-imap: Denial of service via high iteration count for `SCRAM-*` authentication
Summary
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.
Severity
6 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 17:04 UTC
CWE
  • CWE-1322 - Use of Blocking Code in Single-threaded, Non-blocking Context
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
ruby net-imap Affected: >= 0.4.0, < 0.4.24
Affected: >= 0.5.0, < 0.5.14
Affected: >= 0.6.0, < 0.6.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-19484 (GCVE-0-2026-19484)

Vulnerability from cvelistv5 – Published: 2026-08-13 08:50 – Updated: 2026-08-13 14:27
VLAI
Title
@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary
Summary
@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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:26 UTC
CWE
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
  • CWE-1322 - Use of Blocking Code in Single-threaded, Non-blocking Context
Assigner
openjs CNA
References
Impacted products
Vendor Product Version
@fastify/busboy @fastify/busboy Affected: 3.1.0 , < 3.2.1 (semver)
Unaffected: 3.2.1 (semver)
Create a notification for this product.
Credits
LorenzoRD2003 mcollina UlisesGascon
Show details on NVD website
To clipboard 

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Mitigation
Implementation

Generally speaking, blocking calls should be replaced with non-blocking alternatives that can be used asynchronously. Expensive computations should be passed off to worker threads, although the correct approach depends on the framework being used.

Mitigation
Implementation

For expensive computations, consider breaking them up into multiple smaller computations. Refer to the documentation of the framework being used for guidance.

CAPEC-25: Forced Deadlock

The adversary triggers and exploits a deadlock condition in the target software to cause a denial of service. A deadlock can occur when two or more competing actions are waiting for each other to finish, and thus neither ever does. Deadlock conditions can be difficult to detect.

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