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TI-2026-40004 Aliases CVE-2026-55436GHSA-84rm-42xw-mx52

Coder's AI Bridge Proxy skips TLS certificate verification in default configuration

Priority LOW 34CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00258 17th percentileScored 2026-11-07
Fix Fixed coder (coder): 2.34.2, 2.33.8, 2.32.7github.com/coder/coder/v2 (Go): 2.34.2, 2.33.8, 2.32.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
codercoder2.34.0 to before 2.34.2; 2.33.0 to before 2.33.8; 2.30.0 to before 2.32.72.34.2, 2.33.8, 2.32.7Patch availableCNA
—github.com/coder/coder/v2 (Go)2.34.0 to before 2.34.22.34.2Patch availableGHSA-84rm-42xw-mx52
—github.com/coder/coder/v2 (Go)2.33.0 to before 2.33.82.33.8Patch availableGHSA-84rm-42xw-mx52
—github.com/coder/coder/v2 (Go)2.30.0 to before 2.32.72.32.7Patch availableGHSA-84rm-42xw-mx52
  • coder Vendorcoder Affected 2.34.0 to before 2.34.2; 2.33.0 to before 2.33.8; 2.30.0 to before 2.32.7 Fixed in 2.34.2, 2.33.8, 2.32.7 Patch available CNA
  • github.com/coder/coder/v2 (Go) Vendor— Affected 2.34.0 to before 2.34.2 Fixed in 2.34.2 Patch available GHSA-84rm-42xw-mx52
  • github.com/coder/coder/v2 (Go) Vendor— Affected 2.33.0 to before 2.33.8 Fixed in 2.33.8 Patch available GHSA-84rm-42xw-mx52
  • github.com/coder/coder/v2 (Go) Vendor— Affected 2.30.0 to before 2.32.7 Fixed in 2.32.7 Patch available GHSA-84rm-42xw-mx52

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*2.30.0 to before 2.32.7; 2.33.0 to before 2.33.8; 2.34.0 to before 2.34.2Vulnerablecoder
  • cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:* Versions 2.30.0 to before 2.32.7; 2.33.0 to before 2.33.8; 2.34.0 to before 2.34.2 Vulnerable ·coder

Remediation

  • Fix · CNA coder (coder) Fixed in 2.34.2, 2.33.8, 2.32.7
  • Fix · GHSA-84rm-42xw-mx52 github.com/coder/coder/v2 (Go) Fixed in 2.34.2 Advisory →
  • Fix · GHSA-84rm-42xw-mx52 github.com/coder/coder/v2 (Go) Fixed in 2.33.8 Advisory →
  • Fix · GHSA-84rm-42xw-mx52 github.com/coder/coder/v2 (Go) Fixed in 2.32.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55436
  2. 2026-10-03 Alias added: GHSA-84rm-42xw-mx52

References

Patch 2

Other 4

  • TI-2026-34071 Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft CVSS 3.1CRITICAL 9.1
  • TI-2026-32394 Coder vulnerable to workspace auto-creation via crafted URL parameters without user consent CVSS 3.1HIGH 8.8
  • TI-2024-18523 Coder's OIDC authentication allows email with partially matching domain to register CVSS 3.1HIGH 8.2
  • TI-2026-39997 Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled app ID CVSS 3.1HIGH 8.7
  • TI-2026-39996 Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator CVSS 3.1HIGH 8.2
  • TI-2026-39995 Coder vulnerable to SSH config injection via unsanitized server-supplied values in `coder config-ssh` CVSS 3.1HIGH 8.3
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences