Bug 2454500 (CVE-2026-35388)

Summary: CVE-2026-35388 OpenSSH: OpenSSH: Low integrity impact from unconfirmed proxy-mode multiplexing sessions
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: kshier, stcannon, teagle, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in OpenSSH. This vulnerability allows for a low integrity impact due to the omission of connection multiplexing confirmation for proxy-mode multiplexing sessions. A local user, under specific and complex conditions requiring user interaction, could potentially establish a multiplexed session without explicit confirmation, leading to unintended data handling.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2454951    
Bug Blocks:    

Description OSIDB Bzimport 2026-04-02 18:02:25 UTC
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.

Comment 2 errata-xmlrpc 2026-04-30 16:30:22 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:12389 https://access.redhat.com/errata/RHSA-2026:12389

Comment 3 errata-xmlrpc 2026-05-04 09:32:22 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:13380 https://access.redhat.com/errata/RHSA-2026:13380

Comment 4 errata-xmlrpc 2026-05-04 09:42:45 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:13381 https://access.redhat.com/errata/RHSA-2026:13381

Comment 5 errata-xmlrpc 2026-05-04 09:46:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:13383 https://access.redhat.com/errata/RHSA-2026:13383

Comment 6 errata-xmlrpc 2026-05-11 20:09:32 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:16059 https://access.redhat.com/errata/RHSA-2026:16059

Comment 7 errata-xmlrpc 2026-05-19 13:07:59 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19069 https://access.redhat.com/errata/RHSA-2026:19069

Comment 8 errata-xmlrpc 2026-05-19 18:03:04 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19219 https://access.redhat.com/errata/RHSA-2026:19219

Comment 9 errata-xmlrpc 2026-05-27 09:52:37 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:21298 https://access.redhat.com/errata/RHSA-2026:21298

Comment 10 errata-xmlrpc 2026-05-27 18:12:30 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:21398 https://access.redhat.com/errata/RHSA-2026:21398

Comment 11 errata-xmlrpc 2026-06-01 18:46:27 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:22329 https://access.redhat.com/errata/RHSA-2026:22329

Comment 13 errata-xmlrpc 2026-06-02 21:58:01 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:22648 https://access.redhat.com/errata/RHSA-2026:22648

Comment 14 errata-xmlrpc 2026-06-03 04:37:30 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:22564 https://access.redhat.com/errata/RHSA-2026:22564