{"id":"CVE-2026-5525","aliases":["EUVD-2026-21334","GHSA-8hrp-2fqv-gvrx"],"status":"published","title":"Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS","description":"A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).","severity":{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00168,"percentile":0.06227,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-04-10T07:40:59Z","modified":"2026-10-28T11:09:59Z","products":[{"vendor":"notepad++","product":"notepad++"},{"vendor":"notepad++ project","product":"notepad++"},{"vendor":"notepad-plus-plus","product":"notepad\\+\\+"}],"references":[{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/issues/17921","tags":["exploit","Exploit","Issue Tracking","Mitigation","Vendor Advisory","report"]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/pull/17930","tags":["Issue Tracking","Patch","fix"]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bfe7514d68bc559534c046c4ef2d1865267aa2b0","tags":["Patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5525"},{"url":"https://github.com/advisories/GHSA-8hrp-2fqv-gvrx"}],"sources":{"cve":[{"id":"CVE-2026-5525","title":"Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS","description":"A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).","status":"published","published":"2026-04-10T07:40:59.902Z","modified":"2026-04-10T12:49:59.124Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T13:39:27.849196Z"}],"euvd":[{"id":"EUVD-2026-21334","description":"A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).","status":"published","published":"2026-04-10T07:40:59Z","modified":"2026-04-10T12:49:59Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:30.341772Z"}],"ghsa":[{"id":"GHSA-8hrp-2fqv-gvrx","title":"A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop...","description":"A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).","status":"published","published":"2026-04-10T09:31:16Z","modified":"2026-04-10T09:31:21Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:07:24.880377Z"}],"nvd":[{"id":"CVE-2026-5525","description":"A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).","status":"published","published":"2026-04-10T08:16:26.067Z","modified":"2026-10-26T21:10:00.17Z","cvss":[{"version":"3.1","score":6,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:12:13.902911Z"}],"osv":[{"id":"CVE-2026-5525","description":"A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).","status":"published","published":"2026-04-10T08:16:26.067Z","modified":"2026-10-28T11:09:59.34978498Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:11.22012Z"}]}}