CVE & CISA-KEV Catalog

CVE-2026-59999

MEDIUM
5.9
CVSS v3
NVD

Description

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.

CWE-348

How to fix

Remediation Available
opensshDebian
Fixed in:1:10.4p1-1CVE-2026-59999
opensshRocky
Fixed in:main@aarch64RHSA-2026:37382
Fixed in:main@srcRHSA-2026:37382
Fixed in:main@x86_64RHSA-2026:37382
opensshRed Hat / RHEL
Fixed in:main@srcRHSA-2026:37382
Fixed in:main@x86_64RHSA-2026:37382
Fixed in:main@aarch64RHSA-2026:37382
opensshUbuntu
Fixed in:1:8.9p1-3ubuntu0.16USN-8533-1
Fixed in:1:9.6p1-3ubuntu13.18USN-8533-1
openssh-clientUbuntu
Fixed in:1:8.9p1-3ubuntu0.16USN-8533-1
Fixed in:1:9.6p1-3ubuntu13.18USN-8533-1
openssh-serverUbuntu
Fixed in:1:8.9p1-3ubuntu0.16USN-8533-1
Fixed in:1:9.6p1-3ubuntu13.18USN-8533-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityHigh
AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.16%probability of exploitation in 30 days
6thpercentile

Low risk: more likely to be exploited than 6% of all known CVEs.

References

Mailing List1
Release Notes2

Related Vulnerabilities

Other CWE-348 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2025-59951Critical9.14.7%--
CVE-2022-31813Critical9.83.3%-Fix
CVE-2024-45410Critical9.81.5%-Fix
CVE-2021-21373High7.51.2%-Fix
CVE-2021-21374High8.11.0%-Fix
CVE-2022-2255High7.50.7%-Fix

Common questions

How do I fix CVE-2026-59999?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-59999 being actively exploited?

Not that we know of. CVE-2026-59999 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.16% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

How severe is CVE-2026-59999?

CVE-2026-59999 has a CVSS v3 base score of 5.9, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-59999 affect?

Published advisories record a fix for openssh (Debian), openssh (Rocky), openssh (Red Hat / RHEL), openssh (Ubuntu), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-09.