Vulnerability 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.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv
- https://github.com/advisories/GHSA-2g4f-4pwh-qvx6
- https://github.com/ajv-validator/ajv/pull/2588
- https://github.com/ajv-validator/ajv/pull/2590
- https://github.com/ajv-validator/ajv/releases/tag/v6.14.0
- https://github.com/github/advisory-database/pull/6991
FAQ
What is CVE-2025-69873?
CVE-2025-69873 is a vulnerability with a CVSS score of 2.9 (LOW). 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 Poin...
How severe is CVE-2025-69873?
CVE-2025-69873 has been rated LOW with a CVSS base score of 2.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-69873?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.