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Fencer Vulns
low 2.5

CVE-2026-106586 json

In sshd in OpenSSH before 10.6, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not, a…

published 2026-10-06 33 d ago modified 2026-10-13 26 d ago also EUVD-2026-94016

cvss
2.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

In sshd in OpenSSH before 10.6, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not, a different vulnerability than CVE-2026-73283.

Patch / fix

  • OpenBSD OpenSSH 10.6
  • openssh Debian 14 1:10.6p1-1
  • openssh-gssapi Debian 14 1:10.6p1-1

debian advisories DEBIAN-CVE-2026-106586

  • openssh Ubuntu 22.04 LTS 1:8.9p1-3ubuntu0.18
  • openssh Ubuntu 24.04 LTS 1:9.6p1-3ubuntu13.20
  • openssh Ubuntu 26.10 1:10.5p1-1ubuntu3.1
  • openssh Ubuntu 26.04 LTS 1:10.2p1-2ubuntu3.8
  • openssh-gssapi Ubuntu 26.10 1:10.5p1-1ubuntu3.1

ubuntu advisories UBUNTU-CVE-2026-106586

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssh hummingbird 1 10.5p1-1.2.hum1
  • openssh-keycat hummingbird 1 10.5p1-1.2.hum1
  • openssh-server hummingbird 1 10.5p1-1.2.hum1
  • openssh-askpass hummingbird 1 10.5p1-1.2.hum1
  • openssh-clients hummingbird 1 10.5p1-1.2.hum1
  • openssh-keysign hummingbird 1 10.5p1-1.2.hum1
  • openssh-sk-dummy hummingbird 1 10.5p1-1.2.hum1

red hat advisories RHSA-2026:82247

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-106586 updated cvss 2.5

openssh: OpenSSH: Security restriction bypass via unenforced restrict directive in tunnel forwarding

  • Red Hat Hardened Images openssh 10.5p1-1.2.hum1, openssh-keycat 10.5p1-1.2.hum1, openssh-server 10.5p1-1.2.hum1, openssh-askpass 10.5p1-1.2.hum1, openssh-clients 10.5p1-1.2.hum1, openssh-keysign 10.5p1-1.2.hum1, +1 more
    fixed: vendor fix RHSA-2026:82247

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
32 d ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected products

  • OpenBSD OpenSSH

Classification

Weakness
  • CWE-670 Always-Incorrect Control Flow Implementation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.