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, = 2.34.0, < 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.

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

Q: 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.

Q: How is CVE-2026-55434 attacked?

It is attacked over the network, in a software library.

Q: 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.

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

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