KEV Entry

CVE-2026-123158

Known Exploited Vulnerability Entry CISA

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Entry Details
Confirmed Exploited

CVE-2026-123158

2026-11-09 00:00 UTC

Timestamps

2026-11-09

2026-11-09

Scope

OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability | Affected: OpenBSD / OpenSSH | Description: OpenBSD OpenSSH on Linux contains an unexpected status code or return value vulnerability that could allow for authentication bypass. | 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 guidelines. | Due date: 2026-11-12 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://www.openssh.org/releasenotes.html ; https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/ ; https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-123158

References
  • {'id': 'CVE-2026-123158', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-123158'}

4baa1f6a-64e7-423e-83d6-3ff7d13fe020

CISA
405284c2-e461-4670-8979-7fd2c9755a60

2026-11-09 17:00 UTC

2026-11-09 17:00 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-394"
  ],
  "date_added": "2026-11-09",
  "due_date": "2026-11-12",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "OpenSSH",
  "vendorProject": "OpenBSD",
  "vulnerabilityName": "OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability"
}
 -
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