OpenBSD OpenSSH OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability

OpenBSD OpenSSH on Linux contains an unexpected status code or return value vulnerability that could allow for authentication bypass.

EPSS Exploit Probability1.01%

63.5th percentile

Exploit Maturityactive wild

Active Weaponization

Primary VendorsOpenBSD

1 product(s) impacted

Ransomware CampaignUnknown

Threat intel association

CVSS v3.1 Vector Breakdown

Comprehensive attack metric decomposition according to FIRST specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector (AV)NETWORKRemotely exploitable over network

Attack Complexity (AC)LOWNo specialized access needed

Privileges Required (PR)NONEUnauthenticated exploitation

User Interaction (UI)NONEZero-click / autonomous

Scope (S)UNCHANGEDSecurity authority boundary

Confidentiality (C)HIGHTotal information disclosure

Integrity (I)HIGHTotal compromise of system state

Availability (A)NONEComplete resource denial

TechOverwatch AI Security Sentinel Analysis

Model: Gemini 2.0 Flash Security Sentinel · Generated: 2026-11-10

Executive Defense Summary

OpenBSD OpenSSH on Linux contains an unexpected status code or return value vulnerability that could allow for authentication bypass.

Technical Root Cause Architecture

Vulnerability in OpenSSH allowing anomalous execution paths when processing untrusted input.

Exploitation Scenario & Attack Chain

Threat actors issue specially crafted requests to the target service to exploit memory corruption or logic flaws.

Enterprise Blast Radius & Lateral Risk

Potential unauthorized access, service disruption, and lateral movement within the perimeter.

Remediation & Defense Playbook

Immediate actionable steps for DevOps, SecOps, and Security Architects

1Apply 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.

2Apply security updates according to vendor instructions.

3Ensure network firewalls restrict exposure of administrative ports.

Detection Guidance & Threat Hunting

Monitor endpoint execution logs and network traffic for unusual connections originating from OpenSSH.

Sigma Detection Rule (SIEM Export)

title: Suspicious CVE-2026-123158 Activity
status: high
logsource:
  category: process_creation
detection:
  selection:
    CommandLine|contains: 'CVE-2026-123158'
  condition: selection

Affected Software & CPE Matrix

Targeted versions, patched releases, and Common Platform Enumerations

Vendor	Product	Affected Versions	Fixed In
OpenBSD	OpenSSH	All vulnerable builds prior to vendor emergency patch	Refer to vendor advisory for patch release

Official Advisories & Authoritative Sources

CISA KEV Catalog Referencehttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-123158

cisa

NVD Official Detailhttps://nvd.nist.gov/vuln/detail/CVE-2026-123158

advisory

AI Agent & Security Automation Hub

TechOverwatch provides native machine-readable endpoints for autonomous agents, Cursor, Claude, ChatGPT, and automated patch scanners.

Agent CLI Command (curl):

curl -s https://www.techoverwatch.in/api/vulnerabilities/CVE-2026-123158/raw

Raw Markdown JSON API