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Low severity2.9NVD Advisory· Published Feb 11, 2026· Updated Apr 15, 2026

CVE-2025-69873

CVE-2025-69873

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
ajvnpm
>= 7.0.0-alpha.0, < 8.18.08.18.0
ajvnpm
< 6.14.06.14.0

Affected products

60

Patches

Vulnerability mechanics

References

10

News mentions

0

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