Arbitrary code execution via SSH configuration injection
Published Jul 7, 2026 · Updated Jul 8, 2026
SSH configuration injection in Coder allows attackers controlling server-supplied settings to execute code on developer workstations. The config-ssh command writes HostnameSuffix and SSHConfigOptions into the user's SSH configuration without rejecting embedded newlines, allowing an injected ProxyCommand directive. Execution requires a malicious or compromised deployment, a man-in-the-middle position, or administrative control of those settings, plus a user running config-ssh; injected commands run with that user's privileges and affect all SSH connections.
Summary
What happened
SSH configuration injection in Coder allows attackers controlling server-supplied settings to execute code on developer workstations. The config-ssh command writes HostnameSuffix and SSHConfigOptions into the user's SSH configuration without rejecting embedded newlines, allowing an injected ProxyCommand directive. Execution requires a malicious or compromised deployment, a man-in-the-middle position, or administrative control of those settings, plus a user running config-ssh; injected commands run with that user's privileges and affect all SSH connections.
The record
- CVE
- CVE-2026-55427
- Published
- Jul 7, 2026
- Updated
- Jul 8, 2026
- Vendor
- Coder Technologies
- Product
- Coder
- Classifications
- CWE-78, CWE-74, T1204
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 7, 2026CVE publishedPublication date reported by the CVE source.
- Jul 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.29.17
- Affected versionversion=>= 2.30.0, < 2.32.7
- Affected versionversion=>= 2.33.0, < 2.33.8
- Affected versionversion=>= 2.34.0, < 2.34.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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