{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86054", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-04T19:29:21.059Z", "datePublished": "2026-09-22T17:12:38.351Z", "dateUpdated": "2026-09-22T17:12:38.351Z"}, "containers": {"cna": {"title": "Notepad++: Stack Buffer Overflow in `NppParameters::writeSession` via overlong session path", "problemTypes": [{"descriptions": [{"cweId": "CWE-121", "lang": "en", "description": "CWE-121: Stack-based Buffer Overflow", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-pxgg-96p2-c3hx", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-pxgg-96p2-c3hx"}, {"name": "https://github.com/notepad-plus-plus/notepad-plus-plus/commit/046af3f626be7715886412313fc18f58b30dfcaf", "tags": ["x_refsource_MISC"], "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/commit/046af3f626be7715886412313fc18f58b30dfcaf"}, {"name": "https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8", "tags": ["x_refsource_MISC"], "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8"}, {"name": "https://notepad-plus-plus.org/news/v898-released", "tags": ["x_refsource_MISC"], "url": "https://notepad-plus-plus.org/news/v898-released"}], "affected": [{"vendor": "notepad-plus-plus", "product": "notepad-plus-plus", "versions": [{"version": "< 8.9.8", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-22T17:12:38.351Z"}, "descriptions": [{"lang": "en", "value": "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 -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."}], "source": {"advisory": "GHSA-pxgg-96p2-c3hx", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "notepad-plus-plus", "vendor": "notepad-plus-plus", "versions": [{"status": "affected", "version": "< 8.9.8"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 -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."}], "id": "CVE-2026-86054", "lastModified": "2026-09-22T18:17:23.827", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-22T18:17:23.827", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/commit/046af3f626be7715886412313fc18f58b30dfcaf"}, {"source": "security-advisories@github.com", "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8"}, {"source": "security-advisories@github.com", "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-pxgg-96p2-c3hx"}, {"source": "security-advisories@github.com", "url": "https://notepad-plus-plus.org/news/v898-released"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.9.8)"}}], "enrichment": {"confidence": 83.0, "confidence_source": "matching", "scores": [{"score": 83.0, "source": "matching"}]}, "original": {"product": "notepad-plus-plus", "source": "cna", "vendor": "notepad-plus-plus"}, "product": "notepad++", "vendor": "notepad-plus-plus"}], "created": "2026-09-22T18:45:18.930368+00:00", "updated": "2026-09-22T19:00:12.215067+00:00", "vendors": ["notepad-plus-plus", "notepad-plus-plus$PRODUCT$notepad++"]}