{"id":"CVE-2026-54758","summary":"Notepad++: Stack Buffer Overflow in expandNppEnvironmentStrs","details":"Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the expandNppEnvironmentStrs function in PowerEditor/src/WinControls/StaticDialog/RunDlg/RunDlg.cpp copies a Notepad++ variable name between $( and ) into the fixed-size wchar_t str[MAX_PATH] stack buffer without bounding the m loop index, allowing a name of 260 or more characters to corrupt adjacent stack data, terminate the process through __report_gsfailure, and potentially execute code. This issue is fixed in version 8.9.7.","aliases":["GHSA-gv94-327x-2gc5"],"modified":"2026-09-11T08:19:21.394463Z","published":"2026-08-17T20:05:51.923Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-121","CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54758.json"},"references":[{"type":"WEB","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54758.json"},{"type":"ADVISORY","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-gv94-327x-2gc5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54758"},{"type":"FIX","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/0a9527e9f7140a2323e25d14e362b46ee0efc3db"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/notepad-plus-plus/notepad-plus-plus","events":[{"introduced":"0"},{"fixed":"0a9527e9f7140a2323e25d14e362b46ee0efc3db"},{"fixed":"6634650414ff91220a4c353b7fe5ad741af0f9f9"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"8.9.7"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["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-2026-54758.json","vanir_signatures_modified":"2026-09-11T08:19:21Z","vanir_signatures":[{"target":{"file":"PowerEditor/src/WinControls/StaticDialog/RunDlg/RunDlg.cpp"},"deprecated":false,"digest":{"line_hashes":["334229428646160504944987239565152517410","328969565235246161758957266620694167180","79929896174919516706123434099940561774","114755489084487219927720695514385785481","142349942459912568198982065847682283505","217168309658704598160461306797708685299","324123565846550223427109563758010586671"],"threshold":0.9},"id":"CVE-2026-54758-6defd4c9","signature_type":"Line","signature_version":"v1","source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/0a9527e9f7140a2323e25d14e362b46ee0efc3db"},{"source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/6634650414ff91220a4c353b7fe5ad741af0f9f9","target":{"function":"AboutDlg::run_dlgProc","file":"PowerEditor/src/WinControls/AboutDlg/AboutDlg.cpp"},"deprecated":false,"digest":{"length":2313,"function_hash":"321789678466323583525587903832696399039"},"id":"CVE-2026-54758-77046d11","signature_type":"Function","signature_version":"v1"},{"deprecated":false,"digest":{"function_hash":"266463837319559657867228992681787602376","length":1561},"id":"CVE-2026-54758-bb4bda39","signature_type":"Function","signature_version":"v1","source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/0a9527e9f7140a2323e25d14e362b46ee0efc3db","target":{"file":"PowerEditor/src/WinControls/StaticDialog/RunDlg/RunDlg.cpp","function":"expandNppEnvironmentStrs"}},{"deprecated":false,"digest":{"line_hashes":["739341798126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