CVE-2026-55436
Coder's AI Bridge Proxy skips TLS certificate verification in default configuration
Description
Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.30.0 and prior to versions 2.32.7, 2.33.8, and 2.34.2, the AI Bridge Proxy (`aibridgeproxyd`) created a goproxy server whose default transport set `InsecureSkipVerify: true` and only assigned a secure transport when an upstream proxy was configured. In the default configuration (no upstream proxy), outbound HTTPS to the Coder access URL accepted any TLS certificate. Practical exploitation requires an on-path (man-in-the-middle) position between the AI Bridge Proxy and the Coder server. Deployments where they are co-located over loopback are effectively unaffected. The fix in versions 2.32.7, 2.33.8, and 2.34.2 applies the secure transport (TLS 1.2 or higher using system root CAs) unconditionally. As a workaround, ensure the Coder access URL uses a trusted certificate and secure the network path between the AI Bridge Proxy and the Coder server (for example, loopback or mTLS).
INFO
Published Date :
July 8, 2026, 1:16 a.m.
Last Modified :
July 8, 2026, 7:39 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Coder to version 2.32.7 or later.
- Configure Coder access URL with trusted certificates.
- Secure network path between AI Bridge Proxy and Coder.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55436.
| URL | Resource |
|---|---|
| https://github.com/coder/coder/pull/26131 | Issue Tracking Patch |
| 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-84rm-42xw-mx52 | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55436 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55436
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55436 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55436 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:* versions from (including) 2.30.0 up to (excluding) 2.32.7 *cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:* versions from (including) 2.33.0 up to (excluding) 2.33.8 *cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:* versions from (including) 2.34.0 up to (excluding) 2.34.2 Added Reference Type GitHub, Inc.: https://github.com/coder/coder/pull/26131 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/coder/coder/releases/tag/v2.32.7 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/coder/coder/releases/tag/v2.33.8 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/coder/coder/releases/tag/v2.34.2 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/coder/coder/security/advisories/GHSA-84rm-42xw-mx52 Types: Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 08, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-55436', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-08T13:11:39.614123Z'} -
New CVE Received by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'coder', 'product': 'coder', 'versions': [{'status': 'affected', 'version': '>= 2.34.0, < 2.34.2'}, {'status': 'affected', 'version': '>= 2.33.0, < 2.33.8'}, {'status': 'affected', 'version': '>= 2.30.0, < 2.32.7'}]}] Added Description Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.30.0 and prior to versions 2.32.7, 2.33.8, and 2.34.2, the AI Bridge Proxy (`aibridgeproxyd`) created a goproxy server whose default transport set `InsecureSkipVerify: true` and only assigned a secure transport when an upstream proxy was configured. In the default configuration (no upstream proxy), outbound HTTPS to the Coder access URL accepted any TLS certificate. Practical exploitation requires an on-path (man-in-the-middle) position between the AI Bridge Proxy and the Coder server. Deployments where they are co-located over loopback are effectively unaffected. The fix in versions 2.32.7, 2.33.8, and 2.34.2 applies the secure transport (TLS 1.2 or higher using system root CAs) unconditionally. As a workaround, ensure the Coder access URL uses a trusted certificate and secure the network path between the AI Bridge Proxy and the Coder server (for example, loopback or mTLS). Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-295 Added Reference https://github.com/coder/coder/pull/26131 Added Reference https://github.com/coder/coder/releases/tag/v2.32.7 Added Reference https://github.com/coder/coder/releases/tag/v2.33.8 Added Reference https://github.com/coder/coder/releases/tag/v2.34.2 Added Reference https://github.com/coder/coder/security/advisories/GHSA-84rm-42xw-mx52