CVE-2026-6539

medium

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.

References

https://www.vulncheck.com/advisories/notepad-format-string-injection-via-nativelang-xml

https://notepad-plus-plus.org/news/v894-released/

Details

Source: Mitre, NVD

Published: 2026-04-30

Updated: 2026-05-01

Risk Information

CVSS v2

Base Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:P

Severity: Low

CVSS v3

Base Score: 4.4

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Severity: Medium

CVSS v4

Base Score: 4.6

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00013