CVE-2026-78660
Published: October 10, 2026Last modified: October 21, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | HIGH |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | go | Fixed (1.26.9-r0) |
| 25 LTS | go | Fixed (1.26.9-r0) | |
| Stream | go | Fixed (1.27.2-r0) | |
| Hardened Containers | 23 LTS | go | Fixed (1.26.9-r0) |
| 25 LTS | go | Fixed (1.26.9-r0) | |
| Stream | go | Fixed (1.27.2-r0) |