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Vulnerability details

5.5/10
CVSS 4.0
GHSA-2g4f-4pwh-qvx6
resolved Published 2026-02-11 Updated 2026-03-02
GitHub Advisory
Vulnerability Data from Dependency-Track
Affected versions
Score
5.5 CVSS 4.0 GITHUB 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:P
Description
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.
Same vulnerability as
CVE-2025-69873 resolved according to EUVD-2025-207389
Analysis Read only
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