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CVE-2026-123158

8.1, high Known exploited

OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
8.1, high high CVSS v3.1
EPSS, next 30 days
1% higher than 63.4% of scored CVEs
Exploitation
Confirmed in the wild
Published
5 Nov 20265 days ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 9 Nov 2026. US federal agencies must remediate by 12 Nov 2026.

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.

Description

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

Details

Vendor
OpenBSD
Product
OpenSSH
Weakness
CWE-394 (opens in a new tab)
Status
Modified
Updated
10 Nov 2026
Assigner
cve@mitre.org

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

References 18

Exploit code 2

Patches and fixes 2

Advisories 8

Other references 6

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other OpenBSD CVEs

Every OpenBSD CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2020-7247 OpenSMTPD Remote Code Execution Vulnerability KEV EPSS 99% 9.8, critical
  • CVE-2026-106583 In ssh in OpenSSH before 10.6, a $ or \ character can occur in a command-line username, leading to injection EPSS 0.2% 7.8, high
  • CVE-2026-106553 In sshd in OpenSSH before 10.6, credentials can incorrectly persist after failure of a GSSAPIAuthentication authentication attempt EPSS 0.1% 7.5, high
  • CVE-2026-106555 In sshd in OpenSSH before 10.6, GSSAPIAuthentication authentication state can incorrectly be persisted across authentication attempts EPSS 0.1% 7.5, high

Beyond this page

Is CVE-2026-123158 in your network?

This page tells you how dangerous CVE-2026-123158 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-123158 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-123158 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 10 Nov 2026, not the live upstream state.