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ajv (Another JSON Schema Validator) through version 8.17.1 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.
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changed the title
This PR contains the following updates:
8.17.1→8.18.0ajv has ReDoS when using
$dataoptionCVE-2025-69873 / GHSA-2g4f-4pwh-qvx6
More information
Details
ajv (Another JSON Schema Validator) through version 8.17.1 is vulnerable to Regular Expression Denial of Service (ReDoS) when the
$dataoption is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax ($datareference), which is passed directly to the JavaScriptRegExp()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.Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:PReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
ajv-validator/ajv (ajv)
v8.18.0Compare Source
What's Changed
"sideEffects": falsetopackage.jsonby @josdejong in #2480New Contributors
Full Changelog: ajv-validator/ajv@v8.17.1...v8.18.0
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