# CVE-2026-55434: Coder memory exhaustion denial of service in AI Bridge

Source: https://junglewise.ai/threats/cve-2026-55434-coder-memory-exhaustion-denial-of-service-in-ai-bridge  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-07. Updated: 2026-07-07  
License: CC BY 4.0 with a link back

CVE-2026-55434 · Severity: medium · CVSS 6.5 · Published 2026-07-07

Coder, a platform for managing remote development environments, contains a flaw in its AI Bridge component. An authorized user could send a specially crafted, oversized request that exhausts the server's memory. This would cause the entire Coder control plane to crash, resulting in a total service outage for all users until the system is restarted.

Technologies: [Coder](https://junglewise.ai/threats/technologies/coder), [github.com/coder/coder (Go)](https://junglewise.ai/threats/technologies/github-com-coder-coder), [github.com/coder/coder/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-coder-coder-v2). Vendors: [Coder](https://junglewise.ai/threats/vendors/coder), [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-55434 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55434 being exploited in the wild.

**How severe is CVE-2026-55434?** Medium severity, with a CVSS score of 6.5, published 7 July 2026.

**Which products and versions are affected?** Coder >= 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=2.33.0,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-2026-55434?** 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-2026-55434 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-55434?** 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

  ```sh
  go get github.com/coder/coder/v2@v2.34.2
  ```


## Technical details

A resource exhaustion vulnerability (CWE-770) exists in Coder's AI Bridge provider handlers. The affected components used `io.ReadAll` to process incoming request bodies without enforcing a maximum size limit. An authenticated attacker with access to AI Bridge endpoints (such as `/api/v2/aibridge/anthropic/v1/messages`) can transmit an excessively large or chunked POST body, leading to heap memory exhaustion and an Out-Of-Memory (OOM) termination by the operating system. Because the AI Bridge runs in-process with `coderd`, this results in a complete denial of service for the API, workspace coordinator, and DERP relay. The issue is resolved in versions 2.33.8 and 2.34.2 by implementing `http.MaxBytesReader` to cap request sizes.

## Affected products

- Coder Coder >= 2.33.0, < 2.33.8; >= 2.34.0, < 2.34.2

## Identifiers

- CVE-2026-55434
- GHSA-f5vp-w269-392g
- GO-2026-5921

## Timeline

- 2026-06-09: patched: Fix merged into main branch
- 2026-06-11: advisory: Security release versions 2.33.8 and 2.34.2 published
- 2026-07-07: disclosed: CVE-2026-55434 published to NVD

## References

- [https://github.com/coder/coder/pull/26164](https://github.com/coder/coder/pull/26164)
- [https://github.com/coder/coder/releases/tag/v2.33.8](https://github.com/coder/coder/releases/tag/v2.33.8)
- [https://github.com/coder/coder/releases/tag/v2.34.2](https://github.com/coder/coder/releases/tag/v2.34.2)
- [https://github.com/coder/coder/security/advisories/GHSA-f5vp-w269-392g](https://github.com/coder/coder/security/advisories/GHSA-f5vp-w269-392g)

## Related threats

- [Coder AI Gateway encoded path traversal](https://junglewise.ai/threats/cve-2026-121967-coder-2-28-0-before-2-29-22-2-30-0-before-2-34-13-2-35-0-before)
- [Coder missing audience validation in GCP instance-identity endpoint](https://junglewise.ai/threats/cve-2026-118687-coder-before-2-29-21-2-30-0-before-2-34-12-2-35-0-before-2-35-9)
- [Coder open redirect in workspace app proxy](https://junglewise.ai/threats/cve-2026-111931-coder-from-2-0-0-before-2-34-8-contains-an-open-redirect)
- [Coder workspace ACL endpoint authorization bypass](https://junglewise.ai/threats/cve-2026-111930-coder-from-2-26-0-before-2-34-8-contains-an-incorrect)
- [Coder provisioner daemon authorization bypass in DownloadFile](https://junglewise.ai/threats/cve-2026-111929-coder-from-2-30-0-before-2-34-8-contains-an-authorization-bypass)