Vulnerability · CVE-2026-59999
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
Published Jul 8, 2026 · catalog updated Oct 25, 2026 · In sshd in OpenSSH
Last checked Nov 4, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-59999. EPSS is 0.16%. Act only if a listed version of In sshd in OpenSSH is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (In sshd in OpenSSH).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-106583 · High
- CVE-2026-106587 · Low
- CVE-2026-106585 · Medium
- CVE-2026-106584 · Low
- CVE-2026-106582 · Low
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.16%
- Remediation
- Version ranges on file
- Affected products
- cpe openbsd/openssh
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe openbsd/openssh< 10.4
How to fix CVE-2026-59999
Upgrade
CVE-2026-59999 lists a fix boundary at 10.4. Compare the installed build with that boundary before you change production.
Version check
Affected < 10.4
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-59999. EPSS is 0.16%. Act only if a listed version of In sshd in OpenSSH is installed.
Which versions are affected?
Compare what you have installed with < 10.4. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-348. EPSS 0.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jul 8, 2026 · Monitored products — critical
Detected
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
Oct 25, 2026 · Monitored products — critical
Updated
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
Sources
- CVE.orgVulnerability recordCVE-2026-59999
Official CVE identifier
cve.org - Monitored products — criticalVendor advisoryCVE-2026-59999
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
nvd.nist.gov
References
Freshness
Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- CVE.orgNov 4, 2026
- Monitored products — criticalNov 4, 2026