CVE-2026-55436: Coder improper certificate validation in AI Bridge Proxy

CVE-2026-55436 · Severity: high · CVSS 7.4 · Published 2026-07-08

Coder, a platform for managing remote development environments, contains a security flaw in its AI Bridge Proxy component. In certain configurations, the system fails to verify the identity of the server it connects to, allowing a sophisticated attacker positioned on the network to intercept or modify sensitive data. This could lead to the exposure of development secrets or unauthorized access to the environment.

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

Quick answers

Is CVE-2026-55436 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-55436 being exploited in the wild.
How severe is CVE-2026-55436?
High severity, with a CVSS score of 7.4, published 8 July 2026.
Which products and versions are affected?
Coder AI Bridge Proxy >= 2.30.0, < 2.32.7; >= 2.33.0, < 2.33.8; >= 2.34.0, < 2.34.2; Coder >= 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=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-2026-55436?
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-2026-55436 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-55436?
Check whether you run Coder AI Bridge Proxy, Coder, github.com/coder/coder (Go) or one of the others listed 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

An improper certificate validation vulnerability (CWE-295) exists in Coder's AI Bridge Proxy (`aibridgeproxyd`). The component utilized a `goproxy` server that defaulted to `InsecureSkipVerify: true` unless an upstream proxy was explicitly configured. Consequently, in default deployments, outbound HTTPS requests to the Coder access URL would accept any TLS certificate. An attacker with a man-in-the-middle (MITM) position could intercept or alter traffic between the AI Bridge Proxy and the Coder server. The vulnerability is mitigated if the components are co-located on loopback. Patches in versions 2.32.7, 2.33.8, and 2.34.2 enforce secure transport (TLS 1.2+ with system root CAs) unconditionally.

Affected products

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

Identifiers

  • CVE-2026-55436
  • GHSA-84rm-42xw-mx52
  • GO-2026-5920

Timeline

  • 2026-06-08: patched: Fix merged in GitHub pull request #26131
  • 2026-06-11: advisory: Security release versions 2.32.7, 2.33.8, and 2.34.2 published
  • 2026-07-08: disclosed: CVE-2026-55436 published to NVD

References

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