Is this vulnerability remotely exploitable?

Yes, in typical deployments it is remotely exploitable when an attacker can access a web endpoint that uses FPDF AddFont() with insufficient upload restrictions. The attacker does not need local server access; they interact via HTTP.

What level of access does an attacker need?

The attacker generally needs the same level of access required to reach the vulnerable feature—this may be anonymous/public access or any authenticated role that can upload or define fonts. No special system privileges are required beyond that.

What is the safest general fix pattern?

The safest approach is to strictly validate and constrain all files used with AddFont(): only accept expected font definition formats, store them outside of executable directories, and ensure the web server does not interpret them as PHP or other code. Treat all user-influenced files as untrusted content and segregate them from application code.

Severity:

HIGH RISK

(8.8)

Arbitrary File Upload (CWE-434) in FPDF AddFont() Function

CVE-2025-65875

Published:

Feb 3, 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

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CRITICAL RISK

CRITICAL

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Account Takeover / Loss of Account Control

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CWE-77;CWE-78

HIGH RISK

HIGH

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Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Arbitrary File Upload

CWE:

CWE-434

Impact:

Remote Code Execution

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Arbitrary File Upload

CWE:

CWE-434

Impact:

Remote Code Execution

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Arbitrary File Upload (CWE-434) in FPDF AddFont() Function

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

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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