CVE-2026-55432: Coder missing authorization in CreateSubAgent RPC port sharing

CVE-2026-55432 · Severity: medium · CVSS 5.4 · Published 2026-07-08

Coder is a platform used by organizations to manage and deploy remote development environments. A security flaw was identified where workspace owners could bypass administrative restrictions on how development tools and ports are shared within the network. This could allow a user to expose internal applications or services more broadly than intended by the organization's security policy.

Technologies: Coder, github.com/coder/coder (Go), github.com/coder/coder/v2 (Go). Vendors: Coder, Go.

Quick answers

Is CVE-2026-55432 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-55432 being exploited in the wild.
How severe is CVE-2026-55432?
Medium severity, with a CVSS score of 5.4, published 8 July 2026.
Which products and versions are affected?
Coder < 2.29.17, >= 2.30.0 < 2.32.7, >= 2.33.0 < 2.33.8, >= 2.34.0 < 2.34.2; github.com/coder/coder (Go) SEMVER:introduced=0; github.com/coder/coder/v2 (Go) SEMVER:introduced=0,fixed=2.29.17,introduced=2.30.0,fixed=2.32.7,introduced=2.33.0,fixed=2.33.8,introduced=2.34.0,fixed=2.34.2, SEMVER:introduced=2.34.0,fixed=2.34.2.
Is there a fix for CVE-2026-55432?
Yes. github.com/coder/coder/v2 (Go): upgrade to 2.34.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-55432 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-55432?
Check whether you run Coder, github.com/coder/coder (Go) or github.com/coder/coder/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/coder/coder/v2 (Go): upgrade to 2.34.2 or later
    go get github.com/coder/coder/v2@v2.34.2

Technical details

A missing authorization check (CWE-862) exists in Coder's `CreateSubAgent` RPC. The component failed to validate a requested application sharing level against the template's `MaxPortSharingLevel` before persisting workspace applications. An attacker with the ability to register sub-agent apps in a workspace they control can exploit this to bypass administrative port-sharing restrictions. The vulnerability is addressed in versions 2.29.17, 2.32.7, 2.33.8, and 2.34.2 by clamping the sub-agent app sharing level to the template's maximum. A temporary workaround involves disabling wildcard app hostnames via the `CODER_WILDCARD_ACCESS_URL` setting.

Affected products

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

Identifiers

  • CVE-2026-55432
  • GHSA-x9qq-2qh5-8rxf
  • GO-2026-5926

Timeline

  • 2026-06-04: patched: Fix merged into main branch
  • 2026-06-11: advisory: Security releases published for multiple versions
  • 2026-07-08: disclosed: NVD publication date

References

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