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.

Project Subscriptions

Vendors Products
Enterprise Linux Subscribe
Hummingbird Subscribe
Openshift Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

Leave Compression disabled. The client default is already off. Prefer application-level compression instead of SSH compression.

History

Thu, 15 Oct 2026 19:45:00 +0000

Type Values Removed Values Added
References

Thu, 15 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 15 Oct 2026 05:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Openssh: openssh: shared lz77 compression dictionary leaks plaintext across channels
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
Weaknesses CWE-203
CPEs cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-15T19:30:32.279Z

Reserved: 2026-10-15T04:33:35.600Z

Link: CVE-2026-110926

cve-icon Vulnrichment

Updated: 2026-10-15T13:15:35.423Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-15T06:17:01.440

Modified: 2026-10-15T20:17:09.600

Link: CVE-2026-110926

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-15T00:00:00Z

Links: CVE-2026-110926 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-15T11:30:18Z

Weaknesses