CVE-2026-55427

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.

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Produits concernés

• coder
• Coder coder

Scores CVSS

Faiblesses (CWE)

• CWE-74
• CWE-78

Références

• https://github.com/coder/coder/pull/26154 Issue TrackingPatch
• https://github.com/coder/coder/releases/tag/v2.29.17 Release Notes
• https://github.com/coder/coder/releases/tag/v2.32.7 Release Notes
• https://github.com/coder/coder/releases/tag/v2.33.8 Release Notes
• https://github.com/coder/coder/releases/tag/v2.34.2 Release Notes
• https://github.com/coder/coder/security/advisories/GHSA-mcqq-fqgf-rxwm PatchVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories