How severe is CVE-2026-5525?

CVE-2026-5525 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-5525 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5525?

CVE-2026-5525 affects Notepad-plus-plus Notepad++. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5525?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5525 have an EU (EUVD) identifier?

Yes. CVE-2026-5525 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21334.

When was CVE-2026-5525 published?

CVE-2026-5525 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-5525

CVE-2026-5525 is a medium-severity vulnerability in Notepad-plus-plus Notepad++ with a CVSS 3.x base score of 6.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: Medium (CVSS 3.x base score 6.0)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21334
Weakness: CWE-121
Affected product: Notepad-plus-plus Notepad++
Published: 2026-04-10
Last modified: 2026-06-17

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).

Frequently asked questions

What is CVE-2026-5525?: 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).
How severe is CVE-2026-5525?: CVE-2026-5525 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-5525 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5525?: CVE-2026-5525 affects Notepad-plus-plus Notepad++. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5525?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5525 have an EU (EUVD) identifier?: Yes. CVE-2026-5525 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21334.
When was CVE-2026-5525 published?: CVE-2026-5525 was published on 2026-04-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:notepad-plus-plus:notepad\+\+:8.9.3:*:*:*:*:*:*:*

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