CVE-2025-56816

HighPublic PoCRCE

Published: 24 September 2025

Published

24 September 2025

Modified

10 October 2025

KEV Added

—

Patch

—

CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Score 0.0201 83.9th percentile

Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-56816 is a high-severity Path Traversal (CWE-22) vulnerability in Running-Elephant Datart. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 16.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly remediates the directory traversal and unsafe SnakeYAML deserialization flaw by identifying, reporting, and correcting the vulnerability to prevent arbitrary YAML uploads and RCE.

SI-10 Information Input Validation good match

prevent

Enforces validation and sanitization of file upload paths and YAML content to block directory traversal to config/jdbc-driver-ext.yml and malicious deserialization payloads.

SI-7 Software, Firmware, and Information Integrity good match

detect

Monitors the integrity of critical configuration files like jdbc-driver-ext.yml to detect unauthorized modifications from directory traversal exploits.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

The vulnerability involves directory traversal in a web application's file upload endpoint (/api/v1/files/viz/image), enabling attackers to overwrite the config/jdbc-driver-ext.yml file with malicious YAML. The unsafe SnakeYAML deserialization parses this content, allowing arbitrary class instantiation and potential RCE, which aligns with exploitation of a public-facing application.

NVD Description

Datart 1.0.0-rc.3 is vulnerable to Directory Traversal. The configuration file handling of the application allows attackers to upload arbitrary YAML files to the config/jdbc-driver-ext.yml path. The application parses this file using SnakeYAML's unsafe load() or loadAs() method without input sanitization.…

This allows deserialization of attacker-controlled YAML content, leading to arbitrary class instantiation. Under certain conditions, this can be exploited to achieve remote code execution (RCE).

Deeper analysisAI

Datart 1.0.0-rc.3 is vulnerable to a directory traversal flaw (CWE-22) in its configuration file handling, combined with unsafe deserialization (CWE-502). Attackers can upload arbitrary YAML files to the config/jdbc-driver-ext.yml path. The application parses these files using SnakeYAML's unsafe load() or loadAs() methods without input sanitization, enabling deserialization of attacker-controlled YAML content and arbitrary class instantiation. Under certain conditions, this leads to remote code execution (RCE).

The vulnerability carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), indicating exploitation is possible over the network by unauthenticated attackers (PR:N) with low attack complexity (AC:L), though it requires user interaction (UI:R). Successful attacks can achieve high impacts on confidentiality, integrity, and availability, potentially resulting in RCE on the affected system.

References include the Datart GitHub repository at https://github.com/running-elephant/datart and a related repository at https://github.com/xiaoxiaoranxxx/CVE-2025-56815, which may contain additional details on advisories or patches for mitigation.