{"id":"CVE-2026-85279","published":"2026-09-22T18:17:23.213","lastModified":"2026-09-23T18:28:25.093","description":"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.","cvssScore":8.6,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","cwes":["CWE-121"],"vendors":[],"products":[],"references":[{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/70b88f95311d88523cde6be1b1ec938aa48c24bc","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f0175ab73895da41db67a16","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-h2wq-6x75-h8q2","tags":[]},{"url":"https://notepad-plus-plus.org/news/v898-released","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-h2wq-6x75-h8q2","tags":[]}],"exploitRefs":[{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/70b88f95311d88523cde6be1b1ec938aa48c24bc","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f0175ab73895da41db67a16","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-h2wq-6x75-h8q2","tags":[]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-h2wq-6x75-h8q2","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw is a stack buffer overflow in Notepad++ due to improper handling of plugin-supplied lexers, allowing arbitrary code execution. This matters because it can lead to full compromise of the Notepad++ process context.","exploitability":"Exploitation is moderately hard requiring a malicious or compromised plugin that reports more than 30 lexers. Precondition is the user must have the affected version of Notepad++ installed.","blast_radius":"If exploited, the impact is high as it can permit arbitrary code execution within the Notepad++ process context, potentially leading to full system compromise.","remediation":"Upgrade to Notepad++ version 8.9.8 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","code-execution","buffer-overflow","notepad++"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:27:44.189Z"}}