CVE-2025-26506

Critical

Published: 14 February 2025

Published

14 February 2025

Modified

15 January 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0206 84.0th percentile

Risk Priority 21 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-26506 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Hp 499Q9E Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 16.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

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) and 1 other technique. 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 requires timely identification, reporting, and patching of the stack-based buffer overflow flaw in PostScript processing on affected HP printers.

SI-10 Information Input Validation good match

prevent

Mandates validation of PostScript print job inputs to detect and reject malformed data that could trigger the buffer overflow leading to RCE.

SI-16 Memory Protection partial match

prevent

Implements memory protections such as stack guards or DEP that can mitigate exploitation of the stack-based buffer overflow even if input validation fails.

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 →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

The unauthenticated network-accessible stack-based buffer overflow in PostScript processing directly enables remote exploitation of a public-facing printer service (T1190) and achieves RCE with privilege escalation (T1068).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Certain HP LaserJet Pro, HP LaserJet Enterprise, and HP LaserJet Managed Printers may potentially be vulnerable to Remote Code Execution and Elevation of Privilege when processing a PostScript print job.

Deeper analysisAI

CVE-2025-26506 is a critical vulnerability enabling remote code execution (RCE) and elevation of privilege in certain HP LaserJet Pro, HP LaserJet Enterprise, and HP LaserJet Managed Printers. It occurs when processing a PostScript print job and stems from CWE-121 (stack-based buffer overflow). Published on 2025-02-14, the issue carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), highlighting its high severity due to network accessibility and lack of prerequisites.

An unauthenticated attacker with network access to the printer can exploit the vulnerability by sending a malicious PostScript print job. No user interaction or privileges are required, allowing low-complexity exploitation that achieves RCE and privilege escalation, compromising confidentiality, integrity, and availability of the device.

The HP security bulletin at https://support.hp.com/us-en/document/ish_11953771-11953793-16/hpsbpi04007 provides details on mitigation, including affected models and recommended patches or workarounds.