Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls (Go standard library crypto/tls)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.62 % · percentile 50 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Go
- NVD status
- Modified
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.
Weaknesses (CWE)
- CWE-764 — Multiple Locks of a Critical Resource
- CWE-770 — Allocation of Resources Without Limits or Throttling
References
- https://go.dev/cl/763767
- https://go.dev/issue/78334
- https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
- https://pkg.go.dev/vuln/GO-2026-4870
- https://access.redhat.com/security/cve/CVE-2026-32283
- https://bugzilla.redhat.com/show_bug.cgi?id=2456338
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32283.json
- https://access.redhat.com/errata/RHSA-2026:24762
- https://access.redhat.com/errata/RHSA-2026:41019
- https://access.redhat.com/errata/RHSA-2026:16101
- https://access.redhat.com/errata/RHSA-2026:54191
- https://access.redhat.com/errata/RHSA-2026:24761
- https://access.redhat.com/errata/RHSA-2026:54757
- https://access.redhat.com/errata/RHSA-2026:56910
- https://access.redhat.com/errata/RHSA-2026:27076
- https://access.redhat.com/errata/RHSA-2026:14391
- https://access.redhat.com/errata/RHSA-2026:36796
- https://access.redhat.com/errata/RHSA-2026:66401
- https://access.redhat.com/errata/RHSA-2026:28047
- https://access.redhat.com/errata/RHSA-2026:39810
- https://access.redhat.com/errata/RHSA-2026:34365
- https://access.redhat.com/errata/RHSA-2026:20569
- https://access.redhat.com/errata/RHSA-2026:23103
- https://access.redhat.com/errata/RHSA-2026:19715
- https://access.redhat.com/errata/RHSA-2026:16024
- https://access.redhat.com/errata/RHSA-2026:19550
- https://access.redhat.com/errata/RHSA-2026:18032
- https://access.redhat.com/errata/RHSA-2026:18027
- https://access.redhat.com/errata/RHSA-2026:17084
- https://access.redhat.com/errata/RHSA-2026:19719
- https://access.redhat.com/errata/RHSA-2026:19750
- https://access.redhat.com/errata/RHSA-2026:20570
- https://access.redhat.com/errata/RHSA-2026:22713
- https://access.redhat.com/errata/RHSA-2026:19714
- https://access.redhat.com/errata/RHSA-2026:20571
- https://access.redhat.com/errata/RHSA-2026:19450
- https://access.redhat.com/errata/RHSA-2026:10217
- https://access.redhat.com/errata/RHSA-2026:11712
- https://access.redhat.com/errata/RHSA-2026:11881
- https://access.redhat.com/errata/RHSA-2026:11863
- https://access.redhat.com/errata/RHSA-2026:17075
- https://access.redhat.com/errata/RHSA-2026:29195
- https://access.redhat.com/errata/RHSA-2026:23102
- https://access.redhat.com/errata/RHSA-2026:19133
- https://access.redhat.com/errata/RHSA-2026:19139
- https://access.redhat.com/errata/RHSA-2026:19137
- https://access.redhat.com/errata/RHSA-2026:19134
- https://access.redhat.com/errata/RHSA-2026:19136
- https://access.redhat.com/errata/RHSA-2026:22937
- https://access.redhat.com/errata/RHSA-2026:19144
- +93 more
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
Advisories
- GO-2026-4870 — Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls
European references
- ENISA EUVD · EUVD-2026-20014
- GCVE · GCVE-0-2026-32283
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1366 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1281 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1249 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1056 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0888 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0826 — Multiples vulnérabilités dans les produits Elastic · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0627 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0556 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0540 — Multiples vulnérabilités dans VMware Tanzu Gemfire · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0498 — Multiples vulnérabilités dans Zabbix Agent2 · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*< 1.25.9cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*≥ 1.26.0 < 1.26.2
Affected products
| Product | Versions |
|---|---|
| Go standard library · crypto/tls | affected 0 < 1.25.9 ; affected 1.26.0-0 < 1.26.2 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |