How severe is CVE-2026-59997?

CVE-2026-59997 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-59997 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-59997?

CVE-2026-59997 affects Openbsd Openssh. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-59997?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-59997 published?

CVE-2026-59997 was published on 2026-07-08 and last updated on 2026-07-09.

CVE-2026-59997

CVE-2026-59997 is a medium-severity vulnerability in Openbsd Openssh with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1284
Affected product: Openbsd Openssh
Published: 2026-07-08
Last modified: 2026-07-09

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-59997?: CVE-2026-59997 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-59997 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-59997?: CVE-2026-59997 affects Openbsd Openssh. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-59997?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-59997 published?: CVE-2026-59997 was published on 2026-07-08 and last updated on 2026-07-09.

References

Affected products (1)

cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

118.193.56.184 (ipv4-addr)
101.36.114.124 (ipv4-addr)
152.32.149.19 (ipv4-addr)
165.22.134.80 (ipv4-addr)
172.174.212.111 (ipv4-addr)
43.157.27.211 (ipv4-addr)
112.124.67.212 (ipv4-addr)
121.43.116.1 (ipv4-addr)