---
id: CVE-2026-110926
title: A flaw was found in OpenSSH
summary: >-
  A flaw was found in OpenSSH. When compression is negotiated, channels on the
  same connection share one LZ77 dictionary. A peer who can write on one channel
  can recover plaintext from another channel by chosen-plaintext lengths.
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-203
vendor: Red Hat
product: openssh
affected:
  - openssh
  - openssh
  - openssh
  - openssh
  - openssh
  - openshell
  - openssh (all versions)
  - openshift/ose-rhel-coreos-8
  - openshift/ose-rhel-coreos-9
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:33:26.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110926'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-110926'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2553035'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110926.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-110926'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110926'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82247'
    label: 'RHSA-2026:82247'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T13:15:00.361119Z'
ingestedAt: '2026-10-15T05:52:45.969Z'
epss: 0.00302
epssPercentile: 0.21596
---

## Overview

A flaw was found in OpenSSH. When compression is negotiated, channels on the same connection share one LZ77 dictionary. A peer who can write on one channel can recover plaintext from another channel by chosen-plaintext lengths.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · no fix planned: Red Hat Hardened Images · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110926.json)