CVE-2026-86054

highpriority · track · 0EPSS 0.002 · 13 %ileDE
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.23% (13th) EPSS
CVSS 7.8 · high
Is it mine?
2 products
Check your exposure
Who says so?
1 sources
cert_bund

EPSS · scored 2026-10-27

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.8
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · security-advisories@github.comexploitability 1.8 · impact 5.9
v3.17.1highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-121US
04

affected products (2)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-2968Notepad++: Mehrere SchwachstellenDeutsch2026-08-23csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Notepad++ ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Windows-Authentifizierungsdaten offenzulegen, Dateien zu löschen oder zu manipulieren, beliebigen Code auszuführen oder Denial-of-Service-Zustände herbeizuführen.

06

sources

Which sources assert this record, and when.

cert_bundNVDCVE.orgMITRE
published 2026-09-22modified 2026-09-28
07

references (4) nvd

External citations — patches, advisories, analysis.

scry

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