Cyber Resilience

CVE-2026-4546

HighPublic PoCLPE

Published: 22 March 2026

Published
22 March 2026
Modified
30 April 2026
KEV Added
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Patch
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CVSS Score v4 7.3 CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0021 11.4th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-4546 is a high-severity Untrusted Search Path (CWE-426) vulnerability in Flos-Freeware Notepad2. Its CVSS base score is 7.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique DLL (T1574.001); ranked at the 11.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

A weakness has been identified in Flos Freeware Notepad2 4.2.25. This impacts an unknown function in the library TextShaping.dll. Executing a manipulation can lead to uncontrolled search path. The attack is restricted to local execution. The attack requires a high…

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level of complexity. The exploitability is said to be difficult. The vendor was contacted early about this disclosure but did not respond in any way.

CWE(s)
CWE-426CWE-427

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1574.001 DLL Stealth
Adversaries may abuse dynamic-link library files (DLLs) in order to achieve persistence, escalate privileges, and evade defenses.
attack.mitre.org →
Why these techniques?

Direct uncontrolled search path (CWE-426/427) in TextShaping.dll enables DLL Search Order Hijacking (T1038) via local placement of a malicious DLL.

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

Affected Assets

flos-freeware
notepad2
4.2.25

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References