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CVE-2026-6539

Notepad++ 8.9.3 Format String Injection via nativeLang.xml

Published: Apr 30, 2026Updated: May 1, 2026 Sources: CVE List NVDCWE-134
4.4MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 91.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:LI:NA:L
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-134

Affected Products

Notepad++
oss-projectaka notepadplusplus, notepad plus plus
Notepad++Mixed
Consumer Software / productivity
notepad-plus-plus
commercialaka notepad++, notepad plus plus, notepad+ plus
notepad\+\+On-prem
Consumer Software / productivity

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://notepad-plus-plus.org/news/v894-released/
notepad-plus-plus.org
https://www.vulncheck.com/advisories/notepad-format-string-injection-via-nativelang-xml
vulncheck.com

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