CVE-2026-55432 coder CVE debrief

Who should care

Administrators and users of Coder versions prior to 2.29.7, 2.32.7, 2.33.8, and 2.34.2 should be aware of this vulnerability and take steps to mitigate it. This includes reviewing the configuration of their Coder instances, ensuring that the maximum port sharing level is properly set, and monitoring for potential exploitation.

Technical summary

The `CreateSubAgent` RPC in Coder did not properly validate app sharing levels, allowing potential escalation of privileges. The fix clamps the sub-agent app sharing level to the template's `MaxPortSharingLevel`. This vulnerability requires the ability to register sub-agent apps in a workspace the attacker controls. Administrators should review the configuration of their Coder instances to ensure that the maximum port sharing level is properly set.

Defensive priority

Medium

Recommended defensive actions

• Update to Coder versions 2.29.7, 2.32.7, 2.33.8, or 2.34.2 or later
• Disable wildcard app hostnames (CODER_WILDCARD_ACCESS_URL) as a workaround
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record was published on 2026-07-08T01:16:27.620Z and has not been modified since then. The NVD entry is currently 5.4 MEDIUM. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The CVE record does not provide additional details on the exploitation of this vulnerability.

Official resources