HOMEVULNERABILITIESCVE-2026-6539
MEDIUM

CVE-2026-6539

CWE-134Published: April 30, 2026· Updated: May 1, 2026

4.4
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official Description

Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.

NVD Source

Technical Analysis

CVE-2026-6539 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Affected Vendors & Products

notepad-plus-plus1 product
notepad\+\+
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.vulncheck.com/advisories/notepad-format-string-injection-via-nativelang-xml

All References (2)

→
https://notepad-plus-plus.org/news/v894-released/Release Notes
→
https://www.vulncheck.com/advisories/notepad-format-string-injection-via-nativelang-xmlThird Party Advisory

Quick Facts

CVE IDCVE-2026-6539
CVSS Score4.4 / 10
SeverityMEDIUM
WeaknessCWE-134
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedApr 30, 2026

Related CVEs (CWE-134)

CVE-2026-50211
9.8
CVE-2026-57877
8.6
CVE-2026-33210
8.3
CVE-2025-30269
8.1
CVE-2026-6250
8.1
CVE-2026-44407
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-6539 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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