Buffer overflow in Notepad-Plus-Plus
CVE-2026-85279
Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in PluginsManager::loadPluginFromPath in PowerEditor/src/MISC/PluginsManager/PluginsManager.cpp because the plugin-supplied GetLexerCount() result controls a loop that writes to containers[30] without enforcing NB_MAX_EXTERNAL_LANG. A malicious or compromised plugin that reports more than 30 lexers can write beyond the stack array and corrupt control data, which can permit arbitrary code execution in the Notepad++ process context. This issue is fixed in version 8.9.8.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Notepad-Plus-Plus — versions < 8.9.8
Weakness classification (CWE)
References
- github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-h2wq-6x…
- github.com/notepad-plus-plus/notepad-plus-plus/commit/70b88f95311d88523cde6be1b…
- github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f0175ab7…
- github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8
- notepad-plus-plus.org/news/v898-released
Frequently asked questions
- What is CVE-2026-85279?
- CVE-2026-85279 is a high-severity vulnerability in Notepad-Plus-Plus, classified under Stack-based Buffer Overflow. CVSS score: 8.6/10. Published 2026-09-22.
- How severe is CVE-2026-85279?
- High severity. CVSS v3 base score is 8.6 out of 10.