CISA adds CVE-2026-123158: OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability

CISA added CVE-2026-123158 to its Known Exploited Vulnerabilities catalog on 2026-11-09. OpenBSD OpenSSH on Linux contains an unexpected status code or return value vulnerability that could allow for authentication bypass. Required action listed by CISA: 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.