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Fencer Vulns
low 3.7

CVE-2026-106582 json

In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "C…

published 2026-10-06 33 d ago modified 2026-10-13 26 d ago also EUVD-2026-94004

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 "Crossing the Streams" findings.

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-2026-106582

  • 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-2026-106582

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-2026-106582 updated cvss 3.7

openssh: openssh: Information disclosure via shared compression side-channel

  • 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 Red Hat Enterprise Linux 8 openssh, openssh-cavs, openssh-ldap, openssh-keycat, openssh-server, openssh-askpass, +2 more Red Hat Enterprise Linux 9 openssh, openssh-keycat, openssh-server, openssh-askpass, openssh-clients, pam_ssh_agent_auth Red Hat Enterprise Linux 10 openssh Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    under investigation
  • 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 Hardened Images openshell
    not affected: component 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
32 d ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • OpenBSD OpenSSH

Classification

Weakness

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.