CVE-2025-52939

Memory corruption via unbalanced Lua error stack

Published Jun 23, 2025 · Updated Jun 23, 2025

Out-of-bounds write in Notepad Next 0 through 0.11 allows local users to corrupt process memory through embedded Lua error handling. The luaG_runerror path retains the original message after luaG_addinfo pushes an annotated replacement, while luaV_concat adjusts L->top against a changed stack. The public record does not identify the triggering document or script, and the established consequence is memory corruption rather than code execution.

CVSS severity9.4
Critical
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Notepad Next 0 through 0.11 allows local users to corrupt process memory through embedded Lua error handling. The luaG_runerror path retains the original message after luaG_addinfo pushes an annotated replacement, while luaV_concat adjusts L->top against a changed stack. The public record does not identify the triggering document or script, and the established consequence is memory corruption rather than code execution.

The record

CVE
CVE-2025-52939
Published
Jun 23, 2025
Updated
Jun 23, 2025
Vendor
dail8859
Product
Notepad Next
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=v0.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

dail8859 · Notepad Nextversion=0 <=v0.11

Published CVSS scores

9.4GovTech CSGCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/S:N/AU:Y/R:U/V:C/RE:M/U:Red

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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