OpenSSH: Relative Path Traversal (CVE-2026-106552)

What is affected, what to do

In sftp in OpenSSH before 10.6, a server can trigger directory traversal (causing files to be written to unintended locations) during a recursive copy operation.

Update OpenBSD OpenSSH to version 10.6.

Affected

• OpenBSD OpenSSH lt *..10.6

Fixed in

• OpenBSD OpenSSH 10.6

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2

NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

Read in glossary

Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.

CRA

The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

Read in glossary

From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.

ISO/IEC 27001

ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

Read in glossary

Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

In sftp in OpenSSH before 10.6, a server can trigger directory traversal (causing files to be written to unintended locations) during a recursive copy operation.

Source: BSI WID Portal

Vendors and products

• OpenBSD OpenBSD OpenSSH
• Open Source Openssh
• Ubuntu Openssh
• Ubuntu Openssh-gssapi

Weakness classes (CWE)

• CWE-23Relative Path Traversal

  Base

  The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

  Entry at MITRE CWE-23

References & sources

• openssh.orgreleasenotes.html
• arxiv.orgabs/2609.07709

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

1. 13.10.2026Initial analysis by NVDNVD

   Newly listed as affected:

   • OpenBSD OpenSSH (before 10.6)

   CVSS V3.1: AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

   New references:

   • https://www.openssh.org/releasenotes.html#10.6
   Show 3 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   CVSS	added	—	AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
   Product configuration	added	—	OR *cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* versions up to (excluding) 10.6
   Reference type	added	—	MITRE: https://www.openssh.org/releasenotes.html#10.6 Types: Release Notes

   Source identifier: nvd@nist.gov

2. 07.10.2026Record modifiedCISA ADP

   CISA assessment (SSVC): exploitation: none known, automatable: no

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   SSVC assessment	added	—	{"id":"CVE-2026-106552","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-07T21:11:55.723070Z"}

   Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

3. 06.10.2026ReceivedMITRE

   CVSS V3.1: AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L

   Weakness type: CWE-23

   Description added or changed

   New references:

   • https://www.openssh.org/releasenotes.html#10.6
   Show 5 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Description	added	—	In sftp in OpenSSH before 10.6, a server can trigger directory traversal (causing files to be written to unintended locations) during a recursive copy operation.
   CVSS	added	—	AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L
   Weakness type (CWE)	added	—	CWE-23
   Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/106xxx/CVE-2026-106552.json">CVE-2026-106552</a>
   Reference	added	—	https://www.openssh.org/releasenotes.html#10.6

   Source identifier: cve@mitre.org