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Vulnerability record · CVE-2026-55427 · published 8 July 2026

CVE-2026-55427: Coder injection vulnerability

Coder · Coder

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.

8.3 CVSS 3.1 High EPSS 0.47% · top 62.2% CWE-74 · InjectionCWE-78 · OS command injection
8.3CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
8 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2026-46354Coder improper verification of cryptographic signature vulnerabilityCoder allows organizations to provision remote development environments via Terraform. In versions prior tp 2.24.5, 2.29.13, 2.30.8, 2.31.12, 2.32.2,…EPSS 0.32%8.8CVE-2026-44454Coder os command injection vulnerabilityCoder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7 and 2.30.2, the `dotfiles` registry m…EPSS 2.6%8.7CVE-2026-55429Coder insecure direct object reference vulnerabilityCoder 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, `UpsertW…EPSS 0.51%8.2CVE-2026-55428Coder improper authorization vulnerabilityCoder 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, the tail…EPSS 0.40%8.2CVE-2024-27918Coder improper input validation vulnerabilityCoder allows oragnizations to provision remote development environments via Terraform. Prior to versions 2.6.1, 2.7.3, and 2.8.4, a vulnerability in …EPSS 0.97%8.1CVE-2025-58437Coder insufficient session expiration vulnerabilityCoder allows organizations to provision remote development environments via Terraform. In versions 2.22.0 through 2.24.3, 2.25.0 and 2.25.1, Coder ca…EPSS 0.38%7.4CVE-2026-55436Coder improper certificate validation vulnerabilityCoder allows organizations to provision remote development environments via Terraform. Starting in version 2.30.0 and prior to versions 2.32.7, 2.33.…EPSS 0.26%7.4CVE-2026-55076Coder improper authentication vulnerabilityCoder 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's …EPSS 0.61%

Source: NIST National Vulnerability Database (record CVE-2026-55427), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.