# CVE-2026-33814: Go net/http infinite loop in HTTP/2 SETTINGS frame processing

Source: https://junglewise.ai/threats/cve-2026-33814-go-net-http-infinite-loop-in-http-2-settings-frame-processing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-07. Updated: 2026-06-30  
License: CC BY 4.0 with a link back

CVE-2026-33814 · Severity: high · CVSS 7.5 · Published 2026-05-07

A vulnerability in the Go programming language's networking library can allow a malicious server to crash or freeze a client application. By sending a specially crafted HTTP/2 configuration message, the server forces the client into an infinite processing loop. This results in a denial-of-service (DoS) condition, making the affected application unresponsive and consuming system resources.

Technologies: [golang.org/x/net (Go)](https://junglewise.ai/threats/technologies/golang-org-x-net), [stdlib (Go)](https://junglewise.ai/threats/technologies/go-stdlib). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Go Project](https://junglewise.ai/threats/vendors/go-project), [Google](https://junglewise.ai/threats/vendors/google).

## Quick answers

**Is CVE-2026-33814 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33814 being exploited in the wild.

**How severe is CVE-2026-33814?** High severity, with a CVSS score of 7.5, published 7 May 2026.

**Which products and versions are affected?** golang.org/x/net (Go) SEMVER:introduced=0,fixed=0.53.0; stdlib (Go) SEMVER:introduced=0,fixed=1.25.10,introduced=1.26.0-0,fixed=1.26.3; Go Project Go http2 package before v0.53.0; Google X/Net/Http2 < 0.53.0.

**Is there a fix for CVE-2026-33814?** Yes. golang.org/x/net (Go): upgrade to 0.53.0 or later; stdlib (Go): upgrade to 1.26.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-33814 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-33814?** Check whether you run golang.org/x/net (Go), stdlib (Go), Go Project Go http2 package or one of the others listed 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

- golang.org/x/net (Go): upgrade to 0.53.0 or later

  ```sh
  go get golang.org/x/net@v0.53.0
  ```

- stdlib (Go): upgrade to 1.26.3 or later

  ```sh
  go get stdlib@v1.26.3
  ```


## Technical details

A denial-of-service vulnerability exists in the Go net/http and golang.org/x/net/http2 packages. The root cause is an 'Infinite Loop' (CWE-835) triggered when the HTTP/2 transport receives a SETTINGS frame containing a SETTINGS_MAX_FRAME_SIZE value of 0. This causes the transport to enter a loop continuously writing CONTINUATION frames. An unauthenticated remote attacker acting as a malicious server can exploit this against any Go-based client using the affected HTTP/2 transport. The issue is resolved in Go versions 1.25.10 and 1.26.3, and x/net/http2 version v0.53.0.

## Affected products

- Go Project Go net/http before 1.25.10, from 1.26.0-0 before 1.26.3
- Go Project golang.org/x/net/http2 before v0.53.0
- Red Hat Red Hat Enterprise Linux 8, 9, 10
- Red Hat Red Hat OpenShift Container Platform 4

## Identifiers

- CVE-2026-33814
- GO-2026-4918

## Timeline

- 2026-03-31: disclosed: Issue reported to Go project via GitHub
- 2026-05-07: advisory: NVD and Go vulnerability report published
- 2026-06-04: patched: Red Hat released security advisories for affected products

## References

- [https://pkg.go.dev/](https://pkg.go.dev/)
- [https://go.dev/cl/761581](https://go.dev/cl/761581)
- [https://go.dev/cl/761640](https://go.dev/cl/761640)
- [https://go.dev/issue/78476](https://go.dev/issue/78476)
- [https://groups.google.com/g/golang-announce/c/qcCIEXso47M](https://groups.google.com/g/golang-announce/c/qcCIEXso47M)
- [https://pkg.go.dev/vuln/GO-2026-4918](https://pkg.go.dev/vuln/GO-2026-4918)
- [https://access.redhat.com/errata/RHSA-2026:23262](https://access.redhat.com/errata/RHSA-2026:23262)

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