How severe is CVE-2025-52939?

CVE-2025-52939 has a CVSS 4.0 base score of 9.4, rated critical severity.

Is CVE-2025-52939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-52939?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-52939 have an EU (EUVD) identifier?

Yes. CVE-2025-52939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18873.

When was CVE-2025-52939 published?

CVE-2025-52939 was published on 2025-06-23 and last updated on 2026-06-17.

CVE-2025-52939

CVE-2025-52939 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. 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-787.

Key facts

Severity: Critical (CVSS 4.0 base score 9.4)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18873
Weakness: CWE-787
Published: 2025-06-23
Last modified: 2026-06-17

Description

Out-of-bounds Write vulnerability in dail8859 NotepadNext (src/lua/src modules). This vulnerability is associated with program files ldebug.C, lvm.C. This issue affects NotepadNext: through v0.11.

Frequently asked questions

What is CVE-2025-52939?: Out-of-bounds Write vulnerability in dail8859 NotepadNext (src/lua/src modules). This vulnerability is associated with program files ldebug.C, lvm.C. This issue affects NotepadNext: through v0.11.
How severe is CVE-2025-52939?: CVE-2025-52939 has a CVSS 4.0 base score of 9.4, rated critical severity.
Is CVE-2025-52939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-52939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-52939 have an EU (EUVD) identifier?: Yes. CVE-2025-52939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18873.
When was CVE-2025-52939 published?: CVE-2025-52939 was published on 2025-06-23 and last updated on 2026-06-17.

References

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