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.

Weaknesses 2

References 6

• github.com https://github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.md
• github.com https://github.com/advisories/GHSA-2g4f-4pwh-qvx6
• github.com https://github.com/ajv-validator/ajv/pull/2588
• github.com https://github.com/ajv-validator/ajv/pull/2590
• github.com https://github.com/ajv-validator/ajv/releases/tag/v6.14.0
• github.com https://github.com/github/advisory-database/pull/6991

Remediation