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CVE-2025-69873

Quick assessment

Affected
ajv.js ajv
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ajv JSON schema validator是Ajv JSON schema validator开源的一个JSON格式验证器。。 Ajv JSON schema validator 8.17.1及之前版本存在安全漏洞，该漏洞源于启用$data选项时容易受到正则表达式拒绝服务攻击，可能导致单个HTTP请求造成完全拒绝服务。

CVSS 2.9 · Low EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
ajv.js ajv < 6.14.0 affected
7.0.0< 8.17.2 affected
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I. Basic Information for CVE-2025-69873

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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 $data: true for dynamic schema validation. This issue is also fixed in version 6.14.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Ajv JSON schema validator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ajv JSON schema validator是Ajv JSON schema validator开源的一个JSON格式验证器。。 Ajv JSON schema validator 8.17.1及之前版本存在安全漏洞，该漏洞源于启用$data选项时容易受到正则表达式拒绝服务攻击，可能导致单个HTTP请求造成完全拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ajv.js ajv 0 ~ 6.14.0 -

II. Public POCs for CVE-2025-69873

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III. Intelligence Information for CVE-2025-69873

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Patches & Fixes for CVE-2025-69873 (3)

Security Blog Posts for CVE-2025-69873 (1)

Vendor Pages for CVE-2025-69873 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1333

V. Comments for CVE-2025-69873

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