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Fencer Intel
medium 6.5

CVE-2026-106585 json

In sshd and ssh in OpenSSH before 10.6, there is no check for whether the maximum packet length is exceeded during decompression of highly…

published last mo. modified 25d ago also EUVD-2026-94014

cvss
6.5
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 8%
public exploits
0
none known

Summary

In sshd and ssh in OpenSSH before 10.6, there is no check for whether the maximum packet length is exceeded during decompression of highly compressed data.

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-2026-106585

  • 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-2026-106585

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

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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-2026-106585 updated cvss 6.5

openssh: openssh: Denial of service via oversized decompressed packets

  • 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
yes
Technical impact
partial
Assessed
25d ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Affected products

  • OpenBSD OpenSSH

Classification

Weakness
  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

References

Sources

Fencer Intel 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.