OpenSSH Compression Flaw Affects Channels on Shared Connections
CVE-2026-110926

5.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
15 October 2026

What is CVE-2026-110926?

A flaw exists in OpenSSH that allows for compromised security when compression is negotiated on shared channels within the same connection. Due to the use of a shared LZ77 dictionary, an attacker with access to one channel can exploit this design to recover plaintext data from another channel. This vulnerability poses a risk as it can potentially lead to unauthorized access and exposure of sensitive information.

References

https://access.redhat.com/security/cve/CVE-2026-110926
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2553035
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Fabian Bäumer and Marcus Brinkmann for reporting this issue.
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