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CVE-2026-59997: internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line arguments, which can be important if a later command-line argument would have helped to ensure the intended security properties of an SFTP connection.

mediumCVSS 4.2CVE-2026-59997

CSIRTS triage

vendor: OpenSSHproduct: OpenSSHOtheraffected: before 10.4
What
OpenSSH's internal-sftp only recognizes the first 9 command-line arguments, potentially compromising SFTP security.
Who is affected
Deployments of OpenSSH before version 10.4 using internal-sftp.
Urgency
Remediation is medium urgency due to the potential security implications, though exploitation is not currently reported.
Action
Upgrade to OpenSSH version 10.4 or later.

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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-2026-59997

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-59997coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for internal-sftp in sshd

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.

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