GO-2026-6610
HTTP/2 transport accepts malformed framing-related headers in net/http
At a glance
- Published
- Updated
- CVE
- CVE-2026-78660
- Aliases
- BIT-golang-2026-78660
Description
Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling.
Affected packages
| Package | Versions |
|---|---|
| Go · stdlib | introduced 0, fixed 1.26.9 |
| Go · stdlib | introduced 1.27.0-0, fixed 1.27.2 |
| Go · golang.org/x/net | introduced 0, fixed 0.60.0 |
References
- https://go.dev/cl/835145 FIX
- https://go.dev/cl/836385 FIX
- https://go.dev/issue/81115 REPORT
- https://groups.google.com/g/golang-announce/c/U2fTuyDJznI WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — Go Vulnerability Database |