CVE-2026-40188Public exploitNetwork attack vector

Authenticated arbitrary file write via unsanitized rename target

Published Apr 10, 2026 · Updated Apr 10, 2026

Path traversal in goshs 1.0.7 through 2.0.0-beta.3 allows remote authenticated users to write outside the SFTP root via rename. The cmdFile Rename branch sanitizes r.Filepath but passes the untrusted r.Target directly to os.Rename as the destination path. Valid SFTP credentials and write access are required; a crafted absolute target can overwrite configuration or authorization files outside the served tree.

CVSS severity7.7
High
EPSS probability0.32%
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 goshs 1.0.7 through 2.0.0-beta.3 allows remote authenticated users to write outside the SFTP root via rename. The cmdFile Rename branch sanitizes r.Filepath but passes the untrusted r.Target directly to os.Rename as the destination path. Valid SFTP credentials and write access are required; a crafted absolute target can overwrite configuration or authorization files outside the served tree.

The record

CVE
CVE-2026-40188
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Patrick Hener
Product
goshs
Classifications
CWE-1314, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 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=>= 1.0.7, < 2.0.0-beta.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Patrick Hener · goshsversion=>= 1.0.7, < 2.0.0-beta.4

Published CVSS scores

7.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1314Missing Write Protection for Parametric Data Values
T1190Exploit Public-Facing Application

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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