CVE-2026-48798Public exploitNetwork attack vector

Arbitrary file write via SCP path traversal

Published Aug 18, 2026 · Updated Aug 18, 2026

Path traversal in ScpClient in SSH.NET before 2026.0.0 allows remote attackers to overwrite local files via malicious SCP names. During recursive downloads, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) combines server-supplied C and D record names into local paths with Path.Combine and does not reject ../, absolute paths, or platform path separators before creating directories or files. Exploitation requires a victim to download a directory from a malicious, compromised, or man-in-the-middle SCP server, after which any path writable by the client process can be created or overwritten.

CVSS severity7.1
High
EPSS probability0.38%
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 ScpClient in SSH.NET before 2026.0.0 allows remote attackers to overwrite local files via malicious SCP names. During recursive downloads, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) combines server-supplied C and D record names into local paths with Path.Combine and does not reject ../, absolute paths, or platform path separators before creating directories or files. Exploitation requires a victim to download a directory from a malicious, compromised, or man-in-the-middle SCP server, after which any path writable by the client process can be created or overwritten.

The record

CVE
CVE-2026-48798
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
SSH.NET
Product
SSH.NET
Classifications
CWE-73, CWE-22
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 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=< 2026.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SSH.NET · SSH.NETversion=< 2026.0.0

Published CVSS scores

7.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

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.

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No observations available

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

Weakness, pattern, technique

CWE-73External Control of File Name or Path
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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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