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CVE-2026-106583 OpenBSD CVE debrief

A vulnerability in OpenSSH before version 10.6 allows for command-line username injection due to the presence of $ or characters. This issue has a CVSS score of 2.5 and is considered low severity. The vulnerability exists because OpenSSH does not properly handle special characters in usernames, which can lead to command injection. Defenders should assess exposure and prioritize verification and remediation. OpenSSH deployments should review user authentication mechanisms to prevent injection and monitor for suspicious activity related to OpenSSH.

Vendor
OpenBSD
Product
OpenSSH
CVSS
LOW 2.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-06
Original CVE updated
2026-10-15
Advisory published
2026-10-06
Advisory updated
2026-10-15

Who should care

Defenders responsible for OpenSSH deployments should assess exposure and prioritize verification and remediation. This includes reviewing user authentication mechanisms to prevent injection and monitoring for suspicious activity related to OpenSSH. Security teams and vulnerability management teams should also be aware of this vulnerability and its potential impact on their organizations.

Why it matters

CVE-2026-106583 is a low-severity vulnerability in OpenSSH that allows for command-line username injection. Defenders should prioritize verification, remediation, and monitoring to prevent potential injection attacks.

  • Verify and upgrade OpenSSH to version 10.6 or later
  • Review user authentication mechanisms to prevent injection
  • Monitor for suspicious activity related to OpenSSH

Technical summary

The vulnerability exists in OpenSSH before version 10.6, where a $ or character in a command-line username can lead to injection. This is due to improper handling of special characters in usernames. The issue has a CVSS score of 2.5 and is considered low severity. Defenders should prioritize verifying and upgrading to OpenSSH version 10.6 or later, and review user authentication mechanisms.

Defensive priority

Defenders should prioritize verifying and upgrading to OpenSSH version 10.6 or later, and review user authentication mechanisms.

Recommended defensive actions

  • Verify OpenSSH version and upgrade to 10.6 or later
  • Review user authentication mechanisms
  • Monitor for suspicious activity

Evidence notes

The CVE record and OpenSSH release notes provide information on the vulnerability and its fix in version 10.6. The vulnerability was publicly disclosed on October 6, 2026, and has a CVSS score of 2.5. There is no information on known exploit activity or additional affected products beyond OpenSSH. Defenders should verify OpenSSH version and upgrade to 10.6 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-106583 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-106583

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-106583 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-106583

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2026-106583

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/106xxx/CVE-2026-106583.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://www.openssh.org/releasenotes.html

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.