CVE-2025-69873

Sažetak

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.

Reference

CVSS

Base:	2.9
Impact:	1.4
Exploitability:	1.4

Pristup

Vektor	Složenost	Autentikacija
LOCAL	HIGH	NONE

Impact

Povjerljivost	Cjelovitost	Dostupnost
NONE	NONE	LOW

CVSS vektor

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Zadnje važnije ažuriranje

02-03-2026 - 21:16

Objavljeno

11-02-2026 - 19:15