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cve recordhighexploited in the wild3 of 3 cataloguesexploit reported

CVE-2026-123158

OpenBSD · OpenSSH · OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS1.0%63.5th percentile
Exploited3 KEV sources
Ransomware useUnknown
Federal fix dueNov 12, 2026
patch window

Called exploited 1 day after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE reserved
  2. CVE publishedsame day
  3. First KEV listing1d
  4. Last KEV listing3d
  5. Last sighting3d

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by3 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

2 public reports collected from VulnCheck and CIRCL, first on Nov 6, 2026. Each links to its original source. We have not verified them.

Description

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

Required action (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.

References

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Our coverage of CVE-2026-123158

CVE-2026-123158

Scans for Sshole Vulnerability (CVE-2026-123158), (Sun, Nov 8th)

Security researchers operating honeypot infrastructure have reported a marked increase in exploitation attempts targeting the recently disclosed Sshole vulnerability, tracked as CVE-2026-123158. Observations gathered through Cowrie honeypots indicate that threat actors are actively scanning for systems susceptible to this flaw, which affects the Secure Shell (SSH) protocol implementation.

CVE-2026-123158

Hackers Target OpenSSH SSHole Flaw Within Hours of Disclosure, Gain Root on Honeypot

Threat actors have begun actively exploiting a recently disclosed security vulnerability in OpenSSH, identified as CVE-2026-123158 and codenamed SSHole, within hours of its public disclosure. According to reports from Previdian, the flaw allows unauthorized individuals to gain root access to affected systems by signing into accounts that do not have a password configured. Researchers confirmed…