ajv up to 8.17.1 RegExp data redos

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in ajv up to 8.17.1. This affects the function RegExp. The manipulation of the argument data results in redos. This vulnerability is known as CVE-2025-69873. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in ajv up to 8.17.1. Affected is the function RegExp. The manipulation of the argument data with an unknown input leads to a redos vulnerability. CWE is classifying the issue as CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-69873 since 01/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1449.003.

The vulnerability scanner Nessus provides a plugin with the ID 298757 (Linux Distros Unpatched Vulnerability : CVE-2025-69873), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (298757) and CERT Bund (WID-SEC-2026-0935). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Red Hat Ansible Automation Platform
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • SUSE Linux
  • Oracle Linux
  • RESF Rocky Linux
  • HCL BigFix
  • IBM DB2
  • IBM App Connect Enterprise
  • Red Hat OpenShift

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.3
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 2.9
CNA Vector (MITRE): 🔒

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Redos
CWE: CWE-1333 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 298757
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-69873

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/09/2026 CVE reserved
02/11/2026 +33 days Advisory disclosed
02/11/2026 +0 days VulDB entry created
06/10/2026 +119 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2025-69873 (🔒)
GCVE (CVE): GCVE-0-2025-69873
GCVE (VulDB): GCVE-100-345600
CERT Bund: WID-SEC-2026-0935 - Red Hat Ansible Automation Platform: Mehrere Schwachstellen

Entryinfo

Created: 02/11/2026 22:40
Updated: 06/10/2026 06:42
Changes: 02/11/2026 22:40 (53), 02/13/2026 02:06 (11), 02/16/2026 12:22 (2), 02/23/2026 15:48 (13), 03/03/2026 00:48 (1), 04/02/2026 20:47 (7), 04/15/2026 23:00 (1), 05/11/2026 08:06 (1), 06/10/2026 06:42 (1)
Complete: 🔍
Cache ID: 216::103

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