Executive brief
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.
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
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