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CVE-2025-69873

2.9 · LOW

ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is enabled.

Published Feb 11, 2026CWE-1333EPSS 0.55%

Overview

CVE-2025-69873 is a low-severity vulnerability. It was published on February 11, 2026 and has a CVSS 3.1 base score of 2.9 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.mdGitHubgithub.com/advisories/GHSA-2g4f-4pwh-qvx6GitHubgithub.com/ajv-validator/ajv/pull/2588GitHubgithub.com/ajv-validator/ajv/pull/2590GitHubgithub.com/ajv-validator/ajv/releases/tag/v6.14.0GitHubgithub.com/github/advisory-database/pull/6991Refaccess.redhat.com/errata/RHSA-2026:10093Refaccess.redhat.com/errata/RHSA-2026:13512Refaccess.redhat.com/errata/RHSA-2026:14774Refaccess.redhat.com/errata/RHSA-2026:15091

How CyberStrike helps

Frequently asked questions

What is CVE-2025-69873?

CVE-2025-69873 is a low-severity vulnerability. It was published on February 11, 2026 and has a CVSS 3.1 base score of 2.9 (LOW).

How severe is CVE-2025-69873?

This vulnerability has a CVSS 3.1 base score of 2.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-69873?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-69873?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-69873 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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