Description
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. This issue is also fixed in version 6.14.0.
INFO
Published Date :
2026-02-11T00:00:00.000Z
Last Modified :
2026-03-03T17:25:31.651Z
Source :
mitre
AFFECTED PRODUCTS
The following products are affected by CVE-2025-69873 vulnerability.
| Vendors | Products |
|---|---|
| Ajv-validator |
|
| Ajv.js |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2025-69873.
