{"id":"CVE-2026-85279","summary":"Notepad++: Stack Buffer Overflow in Plugin Lexer Loading via Unchecked GetLexerCount() Return Value","details":"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.","aliases":["GHSA-h2wq-6x75-h8q2"],"modified":"2026-09-25T08:24:13.248404Z","published":"2026-09-22T17:08:42.474Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-121"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85279.json"},"references":[{"type":"WEB","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8"},{"type":"WEB","url":"https://notepad-plus-plus.org/news/v898-released"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85279.json"},{"type":"ADVISORY","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-h2wq-6x75-h8q2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85279"},{"type":"FIX","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/70b88f95311d88523cde6be1b1ec938aa48c24bc"},{"type":"FIX","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f0175ab73895da41db67a16"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/notepad-plus-plus/notepad-plus-plus","events":[{"introduced":"0"},{"fixed":"70b88f95311d88523cde6be1b1ec938aa48c24bc"},{"fixed":"f1e1c71b090d69ca0f0175ab73895da41db67a16"},{"fixed":"40f896e6f6c49a29b6ca3f559696dd786f40152d"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"8.9.8"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v8.9.7","v8.9.6.4","v8.9.6.2","v8.9.6.1","v8.9.6","v8.9.5","v8.9.4","v8.9.3","v8.9.2","v8.9.1","v8.9","v8.8.9","v8.8.8","v8.8.7","v8.8.6","v8.8.5","v8.8.4","v8.8.3","v8.8.2","v8.8.1","v8.8","v8.7.9","v8.7.8","v8.7.7","v8.7.6","v8.7.5","v8.7.4","v8.7.3","v8.7.2","v8.7.1","v8.7","v8.6.9","v8.6.8","v8.6.7","v8.6.6","v8.6.5","v8.6.4","v8.6.3","v8.6.2","v8.6.1","v8.6","v8.5.8","v8.5.7","v8.5.6","v8.5.5","v8.5.4","v8.5.3","v8.5.2","v8.5.1","v8.5","v8.4.9","v8.4.8","v8.4.7","v8.4.6","v8.4.5","v8.4.4","v8.4.3","v8.4.2","v8.4.1","v8.4","v8.3.3","v8.3.2","v8.3.1","v8.3","v8.2.1","v8.2","v8.1.9.3","v8.1.9.2","v8.1.9.1","v8.1.9","v8.1.8","v8.1.7","v8.1.6","v8.1.5","v8.1.4","v8.1.3","v8.1.2","v8.1.1","v8.1","v8","v7.9.5","v7.9.4","v7.9.3","v7.9.2","v7.9.1","v7.9","v7.8.9","v7.8.8","v7.8.7","v7.8.6","v7.8.5","v7.8.4","v7.8.3","v7.8.2","v7.8.1","v7.8","v7.7.1","v7.7","v7.6.6","v7.6.5","v7.6.4","v7.6.3","v7.6.2","v7.6.1","v7.6","v7.5.9","v7.5.8","v7.5.7","v7.5.6","v7.5.5","v7.5.4","v7.5.3","v7.5.2","v7.5.1","v7.4.2","v7.4.1","v7.4","v7.3.3","v7.3.2","v7.3.1","7.3.1","v7.3","v7.2.2","7.2.2","v7.2.1","v7.2","v7.1","v7","v6.9.2","v6.9.1","v6.9","v6.8.9","v6.8.8","v6.8.7","v6.8.6","v6.8.5","v6.8.4","v6.8.3","v6.8.2","v6.8.1","v6.8","v6.7.9.2","v6.7.9.1","v6.7.9","v6.7.8.2","v6.7.8.1","v6.7.8","v6.7.7","v6.7.5","v6.7.4_-_Je_suis_Charlie_edition","v6.7.3","v6.7.2","v6.7.1","v6.7","v6.6.9","v6.6.8","v6.6.7","v6.6.6_-_Friday_the_13th_edition","v6.6.4","v6.6.3","v6.6.2","v6.6.1","v6.6","v6.5.5","v6.5.4","v6.5.3","v6.5.2","v6.5.1","v6.5","v6.4.5","v6.4.4","v6.4.3","v6.4.2","v6.4.1","v6.4","v6.3.3","v6.3.2","v6.3.1","v6.3","v6.2.3_-_End_of_World_Edition","v6.2.2","v6.2.1","v6.2","v6.1.8","v6.1.7","v6.1.6","v6.1.5","v6.1.4","v6.1.3","v6.1.2","v6.1.1","v6.1","v6","v5.9.8","v5.9.7","v5.9.6.2","v5.9.6.1","v5.9.6","v5.9.5","v5.9.4","v5.9.3","v5.9.2","v5.9.1","v5.9","v5.8.7","v5.8.6","v5.8.5","v5.8.4","v5.8.3","v5.8.2","v5.8.1","v5.8","v5.7","v5.6.8","v5.6.7","v5.6.6","v5.6.5","v5.6.4","v5.6.3","v5.6.2","v5.6.1","v5.6","v5.5.1","v5.5","v5.4.5","v5.4.4","v5.4.3","v5.4.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85279.json","vanir_signatures_modified":"2026-09-25T08:24:13Z","vanir_signatures":[{"signature_type":"Line","signature_version":"v1","source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f0175ab73895da41db67a16","target":{"file":"PowerEditor/src/MISC/PluginsManager/PluginsManager.cpp"},"deprecated":false,"digest":{"line_hashes":["207796132287657304326662841067091607846","153556693332993613947435049971904568857","332887383360866028661949848316255741798","312791939348936290333481667391921799838"],"threshold":0.9},"id":"CVE-2026-85279-7bdd8fad"},{"target":{"file":"PowerEditor/src/MISC/PluginsManager/PluginsManager.cpp","function":"PluginsManager::loadPluginFromPath"},"deprecated":false,"digest":{"function_hash":"18888275817525651637667709024927929137","length":5705},"id":"CVE-2026-85279-ce6dc4e4","signature_type":"Function","signature_version":"v1","source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f0175ab73895da41db67a16"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"}]}