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    CVE-2026-86054

    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.

    Published:Sep 22, 2026
    Last Modified:Sep 28, 2026
    EPS:Sep 22, 2026
    EPSS Score:0.00202
    CVSS Score:7.8

    Affected Products

    Vendor
    Notepad-plus-plus
    Product
    Notepad++

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-121 Stack-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-85279 (CVSS 8.6) — Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer over…
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    CVE-2026-52886 (CVSS 5.1) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, Notepad++ validates the backupFilePath…
    CVE-2026-71858 (CVSS 5.4) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, macros loaded from an attacker-control…
    CVE-2026-54758 (CVSS 7.8) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the expandNppEnvironmentStrs function …
    CVE-2026-73250 (CVSS 5.4) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the Notepad++ Windows 11 x64 and ARM64…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High