OpenBSD OpenSSH Vulnerability CVE-2026-123158
- Investigating(current)
- Trending(upcoming)
- Workaround available(upcoming)
- Resolved(upcoming)
Executive summary
A vulnerability affecting OpenBSD OpenSSH (CVE-2026-123158) has been identified, involving unexpected status codes or return values. Users and administrators are advised to apply mitigations or patches in accordance with vendor instructions and CISA guidance.
No verified workaround yet
None of the linked reports describe a mitigation. Follow this incident to hear when one appears.
Official fixUnder active investigation. No report has identified a root cause yet.
Evidence
1 report · 1 CVEShow
- [1]CVE First reportOpenBSD OpenSSH: CVE-2026-123158 (Unexpected Status Code or Return Value)(opens security advisory in a new tab)
Required action: 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…
by CISA KEV 0upvotes 0comments
Timeline
- First report on security advisory
OpenBSD OpenSSH: CVE-2026-123158 (Unexpected Status Code or Return Value)
Source