CVE-2025-69873 (Low) detected in ajv-8.6.3.tgz, ajv-6.12.6.tgz

[mend-bolt-for-github]

CVE-2025-69873 - Low Severity Vulnerability

Vulnerable Libraries - ajv-8.6.3.tgz, ajv-6.12.6.tgz

ajv-8.6.3.tgz

Another JSON Schema Validator

Library home page: https://registry.npmjs.org/ajv/-/ajv-8.6.3.tgz

Dependency Hierarchy:

• eslint-7.32.0.tgz (Root Library)
  • table-6.7.1.tgz
    • ❌ ajv-8.6.3.tgz (Vulnerable Library)

ajv-6.12.6.tgz

Another JSON Schema Validator

Library home page: https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz

Path to dependency file: /root/package.json

Path to vulnerable library: /root/node_modules/ajv/package.json,/server/client/node_modules/ajv/package.json

Dependency Hierarchy:

• webpack-dev-server-4.2.1.tgz (Root Library)
  • schema-utils-3.1.1.tgz
    • ❌ ajv-6.12.6.tgz (Vulnerable Library)

Found in base branch: main

Vulnerability Details

ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax ($data reference), which is passed directly to the JavaScript RegExp() constructor without validation. An attacker can inject a malicious regex pattern (e.g., "^(a|a)*$") combined with crafted input to cause catastrophic backtracking. A 31-character payload causes approximately 44 seconds of CPU blocking, with each additional character doubling execution time. This enables complete denial of service with a single HTTP request against any API using ajv with $data: true for dynamic schema validation.

Publish Date: 2026-02-11

URL: CVE-2025-69873

CVSS 3 Score Details (2.9)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Local
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-2g4f-4pwh-qvx6

Release Date: 2026-02-11

Fix Resolution: https://github.com/ajv-validator/ajv.git - v8.18.0,https://github.com/ajv-validator/ajv.git - v6.14.0

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