CVE-2025-26506
Published: 14 February 2025
Summary
CVE-2025-26506 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Hp 499Q9E Firmware. Its CVSS base score is 9.2 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 15.7% 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).
Deeper analysis
Certain HP LaserJet Pro, HP LaserJet Enterprise, and HP LaserJet Managed Printers are affected by CVE-2025-26506, a vulnerability that can lead to remote code execution and elevation of privilege during PostScript print job processing. The issue is tracked under CWE-121 and carries a CVSS 4.0 score of 9.2 reflecting network attack vector, high impact on confidentiality, integrity, and availability, and the need for user interaction or specific conditions in some vectors.
An unauthenticated attacker with network access can submit a malicious PostScript job to trigger the flaw, achieving arbitrary code execution and privilege escalation on the printer without requiring prior authentication. The attack complexity is rated high and physical access or specific configuration states may influence exploitability.
HP has published an advisory at https://support.hp.com/us-en/document/ish_11953771-11953793-16/hpsbpi04007 that addresses the affected models and provides mitigation guidance. The EPSS score rose from a low baseline to a peak of 0.0609 on 2026-03-26 before receding to the current value of 0.0206, indicating a period of increased exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-4202
Vulnerability details
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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
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).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires timely identification, reporting, and patching of the stack-based buffer overflow flaw in PostScript processing on affected HP printers.
Mandates validation of PostScript print job inputs to detect and reject malformed data that could trigger the buffer overflow leading to RCE.
Implements memory protections such as stack guards or DEP that can mitigate exploitation of the stack-based buffer overflow even if input validation fails.