Disclosure summary
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
Source-reported weakness categories
CWE-420
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2026-Apr
Open original source · Updated Sep 24, 2026
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 2.5
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | cbl2 openssh 8.9p1-9 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 openssh 8.9p1-9 on CBL-Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 openssh 9.8p1-5 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 openssh 8.9p1-9 | (MSRC status code 3) |
Vendor remediation references
- Release Notes · product IDs 20608-21692
- Vendor guidance · product IDs 20608-21692
- CBL-Mariner Releases · build 9.8p1-6 · product IDs 20632-17084
- Vendor guidance · product IDs 20632-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-04-03T21:02:08-04:00
MODIFIED 2026-09-24T22:28:23-04:00
INGESTED 2026-10-08T12:45:03-04:00