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Vulnerabilities

Vulnerability · CVE-2026-73283

In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.

Published Aug 11, 2026 · catalog updated Oct 23, 2026 · In sshd in OpenSSH

Last checked Oct 28, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-73283. EPSS is 0.15%. 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.
Severity
Low2.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.15%
Remediation
Advisory link
Affected products
Ubuntu:18.04:LTS openssh-ssh1 · Ubuntu:20.04:LTS openssh-ssh1 · Ubuntu:Pro:14.04:LTS openssh · Ubuntu:Pro:16.04:LTS openssh · Ubuntu:Pro:18.04:LTS openssh · Ubuntu:Pro:20.04:LTS openssh

In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was 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.

  • Ubuntu:18.04:LTS openssh-ssh11:7.5p1-8, 1:7.5p1-9, 1:7.5p1-9build1
  • Ubuntu:20.04:LTS openssh-ssh11:7.5p1-11build1
  • Ubuntu:Pro:14.04:LTS openssh1:6.2p2-6, 1:6.2p2-6ubuntu1, 1:6.4p1-1
  • Ubuntu:Pro:16.04:LTS openssh1:6.9p1-2, 1:6.9p1-3, 1:7.1p1-1
  • Ubuntu:Pro:18.04:LTS openssh1:7.5p1-10, 1:7.6p1-4, 1:7.6p1-4ubuntu0.1
  • Ubuntu:Pro:20.04:LTS openssh1:8.0p1-6build1, 1:8.1p1-1, 1:8.1p1-5
  • Ubuntu:Pro:FIPS-updates:16.04:LTS openssh1:7.2p2-4ubuntu2.fips.2.2.3, 1:7.2p2-4ubuntu2.fips.2.4.1, 1:7.2p2-4ubuntu2.fips.2.4.2
  • Ubuntu:Pro:FIPS-updates:18.04:LTS openssh1:7.9p1-10~ubuntu18.04.fips.0.1, 1:7.9p1-10~ubuntu18.04.fips.0.2, 1:7.9p1-10~ubuntu18.04.fips.0.3
  • Ubuntu:Pro:FIPS-updates:20.04:LTS openssh1:8.2p1-4ubuntu0.fips.0.2.1, 1:8.2p1-4ubuntu0.fips.0.4.0, 1:8.2p1-4ubuntu0.fips.0.5.0
  • Ubuntu:Pro:FIPS:16.04:LTS openssh1:7.2p2-4ubuntu2.fips.2.2, 1:7.2p2-4ubuntu2.fips.2.2.1, 1:7.2p2-4ubuntu2.fips.2.10.1
  • Ubuntu:Pro:FIPS:18.04:LTS openssh1:7.9p1-10~ubuntu18.04.fips.0.1, 1:7.9p1-10~ubuntu18.04.fips.0.2
  • Ubuntu:Pro:FIPS:20.04:LTS openssh1:8.2p1-4ubuntu0.fips.0.2.1

How to fix CVE-2026-73283

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-2026-73283. EPSS is 0.15%. Act only if a listed version of In sshd in OpenSSH is installed.

Which versions are affected?

Compare what you have installed with 1:7.5p1-8, 1:7.5p1-9, 1:7.5p1-9build1, 1:7.5p1-11build1, 1:6.2p2-6, 1:6.2p2-6ubuntu1, 1:6.4p1-1, 1:6.9p1-2, 1:6.9p1-3, 1:7.1p1-1, 1:7.5p1-10, 1:7.6p1-4, 1:7.6p1-4ubuntu0.1, 1:8.0p1-6build1, 1:8.1p1-1, 1:8.1p1-5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.15%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

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.

  1. Aug 11, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.

  2. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    openssh fixed in 1:8.9p1-3ubuntu0.17; openssh fixed in 1:9.6p1-3ubuntu13.19; openssh fixed in 1:9.6p1-3ubuntu13.19+Fips1; openssh fixed in 1:10.2p1-2ubuntu3.6

  3. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.

Sources

References

Freshness

Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 28, 2026
  • CVE.orgOct 23, 2026
  • OpenSSF OSV / OSV ScannerOct 23, 2026