CVE-2026-6539 | THREATINT

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.

PUBLISHED Reserved 2026-04-17 | Published 2026-04-30 | Updated 2026-05-01 | Assigner VulnCheck

MEDIUM: 4.6CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

MEDIUM: 4.4CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Problem types

CWE-134 Use of Externally Controlled Format String

Product status

Default status

unaffected

Any version before 8.9.4

affected

Credits

Hazley Samsudin other

References

notepad-plus-plus.org/news/v894-released/ patch

www.vulncheck.com/...mat-string-injection-via-nativelang-xml third-party-advisory

cve.org (CVE-2026-6539)

nvd.nist.gov (CVE-2026-6539)

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