CVE-2026-56853
Published: August 15, 2026Last modified: August 26, 2026
Description
When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.
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 | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | go | Fixed (1.25.14-r0) |
| 25 LTS | go | Fixed (1.25.14-r0) | |
| Stream | go | Fixed (1.26.7-r0) | |
| Hardened Containers | 23 LTS | go | Fixed (1.25.14-r0) |
| 25 LTS | go | Fixed (1.25.14-r0) | |
| Stream | go | Fixed (1.26.7-r0) |