CVE WatchJul 17, 2026

CVE-2025-69873

ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is ena

CVSS

2.9

Low

EPSS

0.5%

p39

KEV

—

Exploit Today

0-100

Published: Feb 11, 2026 · Last modified: Jul 17, 2026 · CWE-1333 · CWE-400

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-06-302026-07-17

Technical 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.

Official references

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