| Name | CVE-2026-56862 |
| Description | Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely. |
| 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/80528
Fixed by: https://github.com/golang/go/commit/95ae6418f3d8c588ecd6fb366707e04b6009028d (go1.27rc3)
Fixed by: https://github.com/golang/go/commit/b6432317a176b1b5595aa597dc1864a4cc4a81b2 (go1.26.6)
Fixed by: https://github.com/golang/go/commit/677cfe54ecac147c4992e38204641bf61662524f (go1.25.13)