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Fencer Vulns
low 2.5

CVE-2026-73283 json

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

published 2026-08-11 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-56892 , GHSA-97p6-qxmv-h7jm , JLSEC-2026-1329

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 4%
public exploits
0
none known

Summary

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

Patch / fix

  • julia OpenSSH_jll 10.5.1+0
  • OpenBSD OpenSSH 10.5
  • openssh Debian 14 1:10.5p1-1
  • openssh-gssapi Debian 14 1:10.5p1-1

debian advisories DEBIAN-CVE-2026-73283

  • openssh Ubuntu 22.04 LTS 1:8.9p1-3ubuntu0.17
  • openssh Ubuntu 24.04 LTS 1:9.6p1-3ubuntu13.19
  • openssh Ubuntu 26.04 LTS 1:10.2p1-2ubuntu3.6
  • openssh Ubuntu Pro FIPS-updates 24.04 LTS 1:9.6p1-3ubuntu13.19+Fips1

ubuntu advisories UBUNTU-CVE-2026-73283

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.hum1
  • openssh-keycat hummingbird 1 10.5p1-1.hum1
  • openssh-server hummingbird 1 10.5p1-1.hum1
  • openssh-askpass hummingbird 1 10.5p1-1.hum1
  • openssh-clients hummingbird 1 10.5p1-1.hum1
  • openssh-keysign hummingbird 1 10.5p1-1.hum1
  • openssh-sk-dummy hummingbird 1 10.5p1-1.hum1
  • openssh RHEL 9 9.9p1-11.el9_8

red hat advisories RHSA-2026:70719RHSA-2026:69130RHSA-2026:69129

  • openssh Linux Micro 6.1 9.6p1-slfo.1.1_7.1
  • openssh SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 9.6p1-150600.6.52.2
  • openssh-askpass-gnome SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 9.6p1-150600.6.52.1
  • openssh SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 8.4p1-150300.3.68.2
  • openssh-askpass-gnome SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 8.4p1-150300.3.68.1
  • openssh Linux Micro 6.0 9.6p1-159998.1.1
  • openssh SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 7.2p2-81.43.1
  • openssh-askpass-gnome SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 7.2p2-81.43.1

suse advisories SUSE-SU-2026:24382-1SUSE-SU-2026:4827-1SUSE-SU-2026:4811-1SUSE-SU-2026:4686-1SUSE-SU-2026:24140-1SUSE-SU-2026:4614-1

  • openssh AlmaLinux 8 8.0p1-34.el8_10
  • openssh-cavs AlmaLinux 8 8.0p1-34.el8_10
  • openssh-ldap AlmaLinux 8 8.0p1-34.el8_10
  • openssh-keycat AlmaLinux 8 8.0p1-34.el8_10
  • openssh-server AlmaLinux 8 8.0p1-34.el8_10
  • openssh-askpass AlmaLinux 8 8.0p1-34.el8_10
  • openssh-clients AlmaLinux 8 8.0p1-34.el8_10
  • pam_ssh_agent_auth AlmaLinux 8 0.10.3-8.34.el8_10

almalinux advisories ALSA-2026:88211ALSA-2026:69129ALSA-2026:69130

  • openssh Rocky Linux 8 8.0p1-34.el8_10
  • openssh Rocky Linux 9 9.9p1-11.el9_8.rocky.0.1
  • openssh Rocky Linux 10 9.9p1-27.el10_2.rocky.0.1

rocky linux advisories RLSA-2026:88211RLSA-2026:69130RLSA-2026:69129

  • openssh Alpine 3.24 10.3_p1-r1

alpine advisories ALPINE-CVE-2026-73283

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssh Azure Linux 3.0 9.8p1-10

azure linux advisories AZL-95532

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-73283 updated cvss 5.4

openssh: OpenSSH: Tunnel forwarding restriction bypass

  • Red Hat Enterprise Linux 6 openssh, openssh-ldap, openssh-server, openssh-askpass, openssh-clients, pam_ssh_agent_auth Red Hat Enterprise Linux 7 openssh, openssh-cavs, openssh-ldap, openssh-keycat, openssh-server, openssh-askpass, +3 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) openssh-askpass 8.0p1-34.el8_10
    fixed: vendor fix RHSA-2026:88211
  • Red Hat Enterprise Linux AppStream (v. 9) openssh-askpass 9.9p1-11.el9_8, pam_ssh_agent_auth 0.10.4-8.11.el9_8
    fixed: vendor fix RHSA-2026:69130
  • Red Hat Enterprise Linux AppStream (v. 10) openssh-askpass 9.9p1-27.el10_2, openssh-keysign 9.9p1-27.el10_2
    fixed: vendor fix RHSA-2026:69129
  • Red Hat Enterprise Linux BaseOS (v. 8) openssh 8.0p1-34.el8_10, openssh-cavs 8.0p1-34.el8_10, openssh-ldap 8.0p1-34.el8_10, openssh-keycat 8.0p1-34.el8_10, openssh-server 8.0p1-34.el8_10, openssh-clients 8.0p1-34.el8_10, +1 more
    fixed: vendor fix RHSA-2026:88211
  • Red Hat Enterprise Linux BaseOS (v. 9) openssh 9.9p1-11.el9_8, openssh-keycat 9.9p1-11.el9_8, openssh-server 9.9p1-11.el9_8, openssh-clients 9.9p1-11.el9_8
    fixed: vendor fix RHSA-2026:69130
  • Red Hat Enterprise Linux BaseOS (v. 10) openssh 9.9p1-27.el10_2, openssh-keycat 9.9p1-27.el10_2, openssh-server 9.9p1-27.el10_2, openssh-clients 9.9p1-27.el10_2
    fixed: vendor fix RHSA-2026:69129
  • Red Hat Hardened Images openssh 10.5p1-1.hum1, openssh-server 10.5p1-1.hum1
    fixed: vendor fix RHSA-2026:70719
show 2 more
  • Red Hat Update Infrastructure 5 rhui5/rhua-rhel9 1790242004, rhui5/installer-rhel9 1790241922
    fixed: vendor fix RHSA-2026:71603
  • Red Hat Hardened Images openssh-keycat 10.5p1-1.hum1, openssh-askpass 10.5p1-1.hum1, openssh-clients 10.5p1-1.hum1, openssh-keysign 10.5p1-1.hum1, openssh-sk-dummy 10.5p1-1.hum1 Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1790241954, rhui5/haproxy-rhel9 1790241900, rhui5/cds-kubernetes-rhel9 1790241897
    not affected: vulnerable code not present

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
2 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% 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
OSV 3.1 2.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
julia OpenSSH_jll
<10.5.1+0
10.5.1+0

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.