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CVE PROGRAM SOURCE RECORD8.3 High

CVE-2026-55427

Coder vulnerable to SSH config injection via unsanitized server-supplied values in `coder config-ssh`

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `coder config-ssh` wrote server-supplied SSH settings (`HostnameSuffix`, `SSHConfigOptions`) into the user's `~/.ssh/config` without sanitizing embedded newlines or restricting directives so a malicious or compromised Coder server could inject arbitrary SSH configuration. Practical exploitation requires control of the server-supplied values through a malicious or compromised deployment, a man-in-the-middle position or admin access to the `HostnameSuffix` and `SSHConfigOptions` settings. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 validates `HostnameSuffix` and `SSHConfigOptions` against a strict character set that rejects newlines and other control characters. As a workaround, inspect `coder config-ssh --dry-run` output before applying changes.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

coder coder

  • >= 2.34.0, < 2.34.2affected
  • >= 2.33.0, < 2.33.8affected
  • >= 2.30.0, < 2.32.7affected
  • < 2.29.17affected

References