| Name | CVE-2026-56853 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1144340, 1144341, 1144342 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| golang-1.15 (PTS) | bullseye | 1.15.15-1~deb11u4 | vulnerable |
| golang-1.19 (PTS) | bookworm | 1.19.8-2 | vulnerable |
| golang-1.24 (PTS) | trixie | 1.24.4-1 | vulnerable |
| golang-1.25 (PTS) | forky, sid | 1.25.12-1 | vulnerable |
| golang-1.26 (PTS) | forky, sid | 1.26.5-1 | vulnerable |
| golang-1.27 (PTS) | forky, sid | 1.27~rc2-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| golang-1.15 | source | (unstable) | (unfixed) | |||
| golang-1.19 | source | (unstable) | (unfixed) | |||
| golang-1.24 | source | (unstable) | (unfixed) | |||
| golang-1.25 | source | (unstable) | (unfixed) | 1144342 | ||
| golang-1.26 | source | (unstable) | (unfixed) | 1144341 | ||
| golang-1.27 | source | (unstable) | (unfixed) | 1144340 |
[trixie] - golang-1.24 <no-dsa> (Minor issue)
https://github.com/golang/go/issues/80205
Fixed by: https://github.com/golang/go/commit/cb4d292bb634ab89a62995f2384df9389d876333 (go1.27rc3)
Fixed by: https://github.com/golang/go/commit/5bbd22ff78daf010c5bd19c466a0c45ac78503d4 (go1.26.6)
Fixed by: https://github.com/golang/go/commit/784132491b1002342026712477725c0d742a53e8 (go1.25.13)