CVE-2026-123158
OpenBSD OpenSSH
OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability
What it is
OpenBSD OpenSSH on Linux contains an unexpected status code or return value vulnerability that could allow for authentication bypass.
What to do
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor notices and references
- alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/
- github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482
- nvd.nist.gov/vuln/detail/CVE-2026-123158
Description and required action as published by CISA. Full record at NVD.