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No exploitation reportedFix available

CVE-2026-106586

OpenSSH restrict keyword ineffective for tunnel forwarding

No exploitation reported by the sources we read.

  • Published2026-10-06
  • Fixed in10.6
  • WeaknessCWE-670

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-10-0621:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-106586?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-106586?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
OpenSSH
BranchAffectedFixed in
10.6< 10.610.6

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-106586 Red Hat Product Security22 products fixed

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

  • RHSA-2026:82247 Red Hat Product Security22 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Full record on NVD

Fix

  1. Update OpenSSH to 10.6
  2. Vendor fix Red Hat Product Security RHSA-2026:82247 · 22 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:82247 · 22 productsThis flaw only affects servers where tunnel forwarding has been explicitly enabled; PermitTunnel is disabled by default in OpenSSH sshd. As a workaround, tunnel forwarding can be disabled by setting "PermitTunnel no" in /etc/ssh/sshd_config (or removing any configuration that enables it) and restar…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-10-07
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.12.5read 2026-10-23
  • NVDCVSS 3.14.3read 2026-10-23
  • CNAweakness (CWE)CWE-670read 2026-10-23
  • FIRST EPSSEPSS score0.1 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Published
2026-10-06
Last Modified
2026-10-13
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-106586?

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.

Is CVE-2026-106586 actively exploited?

Active exploitation of CVE-2026-106586 has not been confirmed. Its EPSS score was 0.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-106586?

CVE-2026-106586 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

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