Description
If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service. This only affects TLS 1.3.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Go standard library | crypto/tls | < 1.25.9; >= 1.26.0-0, < 1.26.2 |
| Red Hat | Cryostat 4 on RHEL 9 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 10 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
References
- https://go.dev/cl/763767Patch
- https://go.dev/issue/78334Issue Tracking
- https://groups.google.com/g/golang-announce/c/0uYbvbPZRWUMailing List, Release Notes
- https://pkg.go.dev/vuln/GO-2026-4870Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:10217
- https://access.redhat.com/errata/RHSA-2026:10219
- https://access.redhat.com/errata/RHSA-2026:10704
- https://access.redhat.com/errata/RHSA-2026:11507
- https://access.redhat.com/errata/RHSA-2026:11514
- https://access.redhat.com/errata/RHSA-2026:11704
- https://access.redhat.com/errata/RHSA-2026:11711
- https://access.redhat.com/errata/RHSA-2026:11712
- https://access.redhat.com/errata/RHSA-2026:11863
- https://access.redhat.com/errata/RHSA-2026:11881
- https://access.redhat.com/errata/RHSA-2026:14162
- https://access.redhat.com/errata/RHSA-2026:14200
- https://access.redhat.com/errata/RHSA-2026:14391
- https://access.redhat.com/errata/RHSA-2026:15980
- https://access.redhat.com/errata/RHSA-2026:16021
- https://access.redhat.com/errata/RHSA-2026:16024
- https://access.redhat.com/errata/RHSA-2026:16101
- https://access.redhat.com/errata/RHSA-2026:16102
- https://access.redhat.com/errata/RHSA-2026:16875
- https://access.redhat.com/errata/RHSA-2026:17075
- https://access.redhat.com/errata/RHSA-2026:17084
- https://access.redhat.com/errata/RHSA-2026:17287
- https://access.redhat.com/errata/RHSA-2026:18027
- https://access.redhat.com/errata/RHSA-2026:18032
- https://access.redhat.com/errata/RHSA-2026:19126
- https://access.redhat.com/errata/RHSA-2026:19132
- https://access.redhat.com/errata/RHSA-2026:19133
- https://access.redhat.com/errata/RHSA-2026:19134
- https://access.redhat.com/errata/RHSA-2026:19135
- https://access.redhat.com/errata/RHSA-2026:19136
- https://access.redhat.com/errata/RHSA-2026:19137
- https://access.redhat.com/errata/RHSA-2026:19139
- https://access.redhat.com/errata/RHSA-2026:19144
- https://access.redhat.com/errata/RHSA-2026:19156
- https://access.redhat.com/errata/RHSA-2026:19350
- https://access.redhat.com/errata/RHSA-2026:19351
- https://access.redhat.com/errata/RHSA-2026:19352
- https://access.redhat.com/errata/RHSA-2026:19353
- https://access.redhat.com/errata/RHSA-2026:19369
- https://access.redhat.com/errata/RHSA-2026:19450
- https://access.redhat.com/errata/RHSA-2026:19550
- https://access.redhat.com/errata/RHSA-2026:19634
- https://access.redhat.com/errata/RHSA-2026:19714
- https://access.redhat.com/errata/RHSA-2026:19715
- https://access.redhat.com/errata/RHSA-2026:19719
- https://access.redhat.com/errata/RHSA-2026:19720
- https://access.redhat.com/errata/RHSA-2026:19721
- https://access.redhat.com/errata/RHSA-2026:19722
- https://access.redhat.com/errata/RHSA-2026:19750
- https://access.redhat.com/errata/RHSA-2026:19839
- https://access.redhat.com/errata/RHSA-2026:20556
- https://access.redhat.com/errata/RHSA-2026:20569
- https://access.redhat.com/errata/RHSA-2026:20570
- https://access.redhat.com/errata/RHSA-2026:20571
- https://access.redhat.com/errata/RHSA-2026:20607
- https://access.redhat.com/errata/RHSA-2026:20608
Timeline
- Published
- Apr 8, 2026
- Last modified
- Sep 18, 2026
- NVD status
- Modified