CVE-2026-55434 coder CVE debrief

Who should care

Users of Coder AI Bridge with authenticated access should apply patches 2.33.8 or 2.34.2 to prevent denial of service. This includes operators, platform administrators, vulnerability management teams, and security teams responsible for maintaining Coder deployments.

Technical summary

In Coder, starting in version 2.33.0 and prior to versions 2.33.8 and 2.34.2, AI Bridge provider handlers read request bodies with `io.ReadAll` without a maximum size. An authenticated user with AI Bridge access could send an arbitrarily large body and exhaust memory, leading to a denial of service. The vulnerability is limited to availability impact. Affected Coder users with AI Bridge access should verify their patch status and apply patches 2.33.8 or 2.34.2. This issue affects Coder deployments where AI Bridge is enabled. The CVSS score of 6.5 (MEDIUM) indicates a medium severity level. Defenders should focus on patching and monitoring AI Bridge endpoints for large request bodies.

Defensive priority

Apply patches 2.33.8 or 2.34.2 immediately. Monitor AI Bridge endpoints for large request bodies and restrict access to necessary users.

Recommended defensive actions

• Apply patches 2.33.8 or 2.34.2
• Monitor AI Bridge endpoints for large request bodies
• Restrict AI Bridge access to necessary users
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record was published on 2026-07-07T21:17:27.290Z and has not been modified since then. The NVD entry is currently 6.5 (MEDIUM). Evidence is limited to CVE and NVD details. Defenders should verify affected product versions and patch status.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.