{
    "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"
            }
        }
    }
}