EUVD-2026-84570Severity by source
AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack surface is a plugin the user must load (AV:L, UI:R, PR:N for the plugin author); corruption stays within the Notepad++ process so S:U, not S:C; full C/I/A on successful ACE.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Loading a crafted Notepad++ plugin that reports more than 30 external lexers can overflow a 30-element stack array inside PluginsManager::loadPluginFromPath(), corrupting adjacent control data and potentially yielding arbitrary code execution in the Notepad++ process; the flaw affects all releases prior to 8.9.8. The attack is local and requires user interaction (the victim must install and load the malicious native plugin DLL), and because any loaded native plugin already runs in-process with full editor privileges, the incremental risk over simply distributing malicious plugin code is minimal - no public exploit identified at time of analysis, and the issue is not reachable remotely or through opened documents. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a malicious or compromised Notepad++ plugin (a native DLL) that implements GetLexerCount() to return a value greater than 30 (NB_MAX_EXTERNAL_LANG) to be installed and loaded by the victim's Notepad++ prior to 8.9.8. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a high-CVSS (8.6) memory-corruption flaw whose real-world priority is materially lower than the score suggests, because the entire attack surface is gated behind a malicious or compromised Notepad++ plugin. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Notepad++ 8.9.8 or later, available from the v8.9.8 release tag and the official announcement page (https://notepad-plus-plus.org/news/v898-released); this is the only complete fix because the patched code re-assigns the clamped lexer count so NB_MAX_EXTERNAL_LANG is enforced, and no backported fix for earlier 8.x branches is identified in the references (see advisory GHSA-h2wq-6x75-h8q2 for details). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Notepad++ installations and identify any version prior to 8.9.8, notify users not to install or load plugins from untrusted sources, and temporarily restrict native plugin installation where feasible. …
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External POC / Exploit Code
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