CVE-2026-57233Public exploitNetwork attack vector

Code execution via unchecked ZIP extraction paths

Published Aug 17, 2026 · Updated Aug 18, 2026

Path traversal in WinGup in Notepad++ before 8.9.7 allows remote attackers to execute code through a crafted plugin ZIP archive. WinGup's decompress function joins each untrusted entry name to the extraction destination without canonical containment validation, allowing ../ components to overwrite a sibling plugin DLL. Code runs in the Notepad++ process after the crafted package is installed and the overwritten plugin is loaded on a later launch.

CVSS severity8.1
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in WinGup in Notepad++ before 8.9.7 allows remote attackers to execute code through a crafted plugin ZIP archive. WinGup's decompress function joins each untrusted entry name to the extraction destination without canonical containment validation, allowing ../ components to overwrite a sibling plugin DLL. Code runs in the Notepad++ process after the crafted package is installed and the overwritten plugin is loaded on a later launch.

The record

CVE
CVE-2026-57233
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Notepad++
Product
Notepad++
Classifications
CWE-22, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record 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=< 8.9.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Notepad++ · Notepad++version=< 8.9.7

Published CVSS scores

8.1GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1203Exploitation for Client Execution

Public exploit references

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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