Bug 2454494 (CVE-2026-35387)

Summary: CVE-2026-35387 OpenSSH: OpenSSH: Information disclosure due to unintended cryptographic algorithm usage
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, rhel-process-autobot, stcannon, teagle, watson-tool-maintainers, 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 the system to use unintended Elliptic Curve Digital Signature Algorithm (ECDSA) algorithms. This occurs because the configuration for accepted public key algorithms is misinterpreted, leading to the use of weaker cryptographic methods than intended. This could potentially allow an attacker to compromise the confidentiality of data.
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: 2454944    
Bug Blocks:    

Description OSIDB Bzimport 2026-04-02 18:02:04 UTC
OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.

Comment 2 errata-xmlrpc 2026-04-30 16:30:18 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 09:32:20 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 09:42:42 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 09:46:03 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 20:09:33 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 13:07:58 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 18:03:03 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 09:52:33 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 18:12:26 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 18:46:21 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 21:58:00 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