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    CVE-2026-48770

    Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.

    Published:Jun 26, 2026
    Last Modified:Jun 29, 2026
    EPS:Jun 26, 2026
    EPSS Score:0.0027
    CVSS Score:5

    Affected Products

    Vendor
    Notepad-plus-plus
    Product
    Notepad++

    Exploits

    https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2https://github.com/atiilla/Notepad-8.9.6-PoC

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-57233 (CVSS 8.1) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the WinGup decompress function joins u…
    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…
    CVE-2026-48778 (CVSS 7.8) — Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the <GUIConfig name="commandLineInte…
    CVE-2026-52885 (CVSS 7.5) — Notepad++ is a free and open-source source code editor. Prior to 8.9.6.4, NppCommands.cpp checks the HMAC of t…
    CVE-2026-46710 (CVSS 7.5) — Notepad++ is a free and open-source source code editor. From 8.9.4 until 8.9.6, Notepad++ contains a local pri…
    CVE-2026-48800 (CVSS 7.8) — Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the <Command> tag text content insid…
    CVE-2026-52884 (CVSS 7.8) — Notepad++ is a free and open-source source code editor. In v8.9.6.1, isInTrustedDirectory() does NOT canonical…

    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