Occurred Nov 9, 2026, 12:00:00 AM UTC

First published Nov 10, 2026, 1:17:15 AM UTC · Last updated Nov 10, 2026, 1:17:15 AM UTC

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

Reported by CISA Known Exploited Vulnerabilities

The source reports an OpenBSD OpenSSH vulnerability on Linux involving an unexpected status code or return value that could allow authentication bypass. It advises applying mitigations under vendor instructions and cited CISA guidance; the source was published November 9, 2026.

Illustrative image: © Belgian Presidency of the Council of the European Union / Julien Nizet — belgium24.eu/Wikimedia Commons, CC BY 2.0

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Why it matters

The source identifies a potential authentication bypass and calls for mitigations in accordance with the cited guidance.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 6/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 1/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 5/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

CISA Known Exploited Vulnerabilities CVE-2026-123158: OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability

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