CVE-2026-59995: sftp in OpenSSH before 10.4 does not properly constrain the location of downloaded files when "sftp server:/path ." is used with an attacker-controlled server.

mediumCVSS 4.2CVE-2026-59995

CSIRTS triage

vendor: OpenSSH product: OpenSSHOtheraffected: before 10.4

What: The sftp command in OpenSSH does not properly constrain file download locations when used with an attacker-controlled server.
Who is affected: Deployments of OpenSSH before version 10.4 using sftp.
Urgency: Remediation is medium urgency as it could lead to unauthorized file access, but no exploitation has been reported.
Action: Upgrade to OpenSSH version 10.4 or later.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 4.2
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59995

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-599950.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59995	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumCVE-2026-59995: sftp in OpenSSH before 10.4 does not properly constrain the location of downloaded files when …nvd

Recent advisories for sftp in OpenSSH

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-59997: internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line argument…nvd · 2026-07-08
mediumCVE-2026-59995: sftp in OpenSSH before 10.4 does not properly constrain the location of downloaded files when …nvd · 2026-07-08
mediumCVE-2026-59997: internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line argument…msrc · 2026-07-02