{"id":"CVE-2026-86054","title":"Notepad++ is a free and open-source source code editor","summary":"Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDi…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-121"],"vendor":"notepad-plus-plus","product":"notepad-plus-plus","affected":["notepad-plus-plus < 8.9.8"],"published":"2026-09-22","updated":"2026-09-28","sourceUpdated":"2026-09-28T18:17:25.420","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86054","references":[{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/046af3f626be7715886412313fc18f58b30dfcaf","label":"security-advisories@github.com"},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8","label":"security-advisories@github.com"},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-pxgg-96p2-c3hx","label":"security-advisories@github.com"},{"url":"https://notepad-plus-plus.org/news/v898-released","label":"security-advisories@github.com"},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-pxgg-96p2-c3hx","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-28T17:35:55.930197Z"},"ingestedAt":"2026-09-22T18:08:12.499Z","epss":0.00228,"epssPercentile":0.1368,"slug":"CVE-2026-86054","body":"## Overview\n\nNotepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDir= into backupPathName[MAX_PATH] with unbounded wcscpy and appends SESSION_BACKUP_EXT with unbounded wcscat. A sufficiently long settings directory causes the backup suffix to exceed the fixed stack buffer when Notepad++ saves the session, and the protected release build terminates through its stack canary, causing denial of service. This issue is fixed in version 8.9.8.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":212069,"id":"CVE-2026-86054","ts":1790619509248,"field":"exploit_available","old":"false","new":"true"}]}