Is this vulnerability remotely exploitable?

Yes, if a service exposes any interface that accepts XML and passes it to fast-xml-parser, a remote attacker can exploit the issue by sending specially crafted XML containing out-of-range numeric entities.

Does an attacker need authenticated access to exploit this?

Not necessarily. Any unauthenticated or low-privilege endpoint that processes XML with the vulnerable parser can be a vector; exploitation only requires the ability to supply or influence XML content.

What is the safest general fix pattern?

Combine robust input validation with defensive error handling: ensure numeric entities are validated before processing, wrap XML parsing in try/catch (or equivalent) constructs, and handle failures gracefully without crashing the service.

Severity:

HIGH RISK

(7.5)

Uncaught Exception on Invalid Numeric XML Entities (CWE-20) in fast-xml-parser

CVE-2026-25128

Published:

Jan 30, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Input Validation Error

CWE:

CWE-20;CWE-248

Impact:

Denial of Service via Application Crash

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Input Validation Error

CWE:

CWE-20;CWE-248

Impact:

Denial of Service via Application Crash

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Uncaught Exception on Invalid Numeric XML Entities (CWE-20) in fast-xml-parser

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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