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Vulnerabilities

Vulnerability · CVE-2026-106583

In ssh in OpenSSH before 10.6, a $ or \ character can occur in a command-line username, leading to injection.

Published Oct 7, 2026 · catalog updated Oct 15, 2026 · In ssh in OpenSSH

Check if you run it

No confirmed exploitation is on record for CVE-2026-106583. EPSS is 0.15%. Act only if a listed version of In ssh in OpenSSH is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In ssh in OpenSSH).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.15%
Remediation
Vendor / distro source
Affected products
cpe openbsd/openssh

In ssh in OpenSSH before 10.6, a $ or \ character can occur in a command-line username, leading to injection.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe openbsd/opensshversion unspecified

How to fix CVE-2026-106583

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-106583. EPSS is 0.15%. Act only if a listed version of In ssh in OpenSSH is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-99. EPSS 0.15%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · Ubuntu Security Notices

    Detected

    It was discovered that OpenSSH's sftp client incorrectly handled paths returned by the server during a recursive copy operation. A remote attacker controlling the server could possibly use this issue to write files to unintended locations. (CVE-2026-106552) It was discovered that OpenSSH's sshd server incorrectly handled GSSAPIAuthentication state across authentication attempts. An attacker could

  2. Oct 15, 2026 · NIST NVD

    Updated

    In ssh in OpenSSH before 10.6, a $ or \ character can occur in a command-line username, leading to injection.

Sources

  • CVE.orgVulnerability recordCVE-2026-106583

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-106583

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-106583

    In ssh in OpenSSH before 10.6, a $ or \ character can occur in a command-line username, leading to injection.

    nvd.nist.gov
  • Ubuntu Security NoticesVendor advisoryCVE-2026-106583

    It was discovered that OpenSSH's sftp client incorrectly handled paths returned by the server during a recursive copy operation. A remote attacker controlling the server could possibly use this issue to write files to unintended locations. (CVE-2026-106552) It was discovered that

    ubuntu.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.