Description
Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Go standard library | crypto/x509 | 1.26.0-0 – < 1.26.1 | 1.26.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | golang-1.26 | 1.26.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | golang-1.26 | No fix yet | — |
| Ubuntu 26.04 LTS | golang-1.24 +2 | No fix yet | — |
| Ubuntu 25.10 | golang-1.24 +1 | No fix yet | — |
| Ubuntu 24.04 LTS | golang-1.24 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | golang-1.24 +2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | golang1.26 +6 | 1.26.2-1.hum1 | RHSA-2026:7291 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLES 15 SP7 | go1.26-openssl | 1.26.1-150600.13.3.1 | SUSE-SU-2026:0976-1 |
| SLES 15 SP6 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLES 15 SP6 | go1.26-openssl | 1.26.1-150600.13.3.1 | SUSE-SU-2026:0976-1 |
| SLES 15 SP5 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLES 15 SP5 | go1.26-openssl | 1.26.1-150000.1.3.1 | SUSE-SU-2026:0993-1 |
| SLES 15 SP4 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLES 15 SP4 | go1.26-openssl | 1.26.1-150000.1.3.1 | SUSE-SU-2026:0993-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | go1.26-openssl | 1.26.1-160000.1.1 | SUSE-SU-2026:21195-1 |
| SLES for SAP 15 SP6 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLES for SAP 15 SP6 | go1.26-openssl | 1.26.1-150600.13.3.1 | SUSE-SU-2026:0976-1 |
| SLES for SAP 15 SP5 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLES for SAP 15 SP5 | go1.26-openssl | 1.26.1-150000.1.3.1 | SUSE-SU-2026:0993-1 |
| SLES for SAP 15 SP4 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLES for SAP 15 SP4 | go1.26-openssl | 1.26.1-150000.1.3.1 | SUSE-SU-2026:0993-1 |
| SLES 16.0 | go1.26-openssl | 1.26.1-160000.1.1 | SUSE-SU-2026:21195-1 |
| SLE HPC 15 SP5 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLE HPC 15 SP5 | go1.26-openssl | 1.26.1-150000.1.3.1 | SUSE-SU-2026:0993-1 |
| SLE HPC 15 SP4 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| SLE HPC 15 SP4 | go1.26-openssl | 1.26.1-150000.1.3.1 | SUSE-SU-2026:0993-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | go1.26 | 1.26.1-1.1 | openSUSE-SU-2026:10299-1 |
| openSUSE Tumbleweed | steampipe | 2.4.1-1.1 | openSUSE-SU-2026:10509-1 |
| openSUSE Leap 16.0 | go1.26 +1 | 1.26.1-160000.1.1 | openSUSE-SU-2026:20537-1, openSUSE-SU-2026:20342-1 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | go1.26 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 |
| openSUSE Leap 15.6 | go1.26-openssl | 1.26.1-150600.13.3.1 | SUSE-SU-2026:0976-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260317T205859-150000.1.152.1 | SUSE-SU-2026:1042-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | go | 1.25.8-r0 | — |
| Alpine v3.24 | rclone | 1.73.5-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | golang | 1.25.8-1 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | dkron +9 | 4.1.0-r2 | — |
| Wolfi rolling | flux-helm-controller | 1.5.3-r1 | — |
| Wolfi rolling | flux-image-automation-controller | 1.1.1-r3 | — |
| Wolfi rolling | flux-image-reflector-controller | 1.1.1-r1 | — |
| Wolfi rolling | flux-notification-controller | 1.8.2-r1 | — |
| Wolfi rolling | flux-source-controller | 1.8.1-r1 | — |
| Wolfi rolling | go-1.26 | 1.26.1-r0 | — |
| Wolfi rolling | grafana-operator | 5.22.1-r0 | — |
| Wolfi rolling | grafana-rollout-operator | 0.35.0-r2 | — |
| Wolfi rolling | metacontroller | 4.13.1-r1 | — |
| Wolfi rolling | nova | 3.11.13-r1 | — |
| Wolfi rolling | pluto | 5.23.5-r1 | — |
| Wolfi rolling | podcli +1 | 6.11.1-r1 | — |
| Wolfi rolling | polaris | 10.1.6-r1 | — |
| Wolfi rolling | stakater-reloader | 1.4.14-r1 | — |
| Wolfi rolling | steampipe | 2.4.0-r2 | — |
| Wolfi rolling | terragrunt | 1.0.0-r1 | — |
| Wolfi rolling | victoriametrics +8 | 1.138.0-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | stdlib | >= 1.26.0-0, < 1.26.1 | 1.26.1 | GO-2026-4600 |
Advisories 14
- WID-SEC-2026-0548 Golang Go: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 12, 2026
- WID-SEC-2026-1007 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2026
- RHSA-2026:7291 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- SUSE-SU-2026:21195-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Apr 22, 2026
- openSUSE-SU-2026:20537-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Apr 22, 2026
- openSUSE-SU-2026:10509-1 steampipe-2.4.1-1.1 on GA media SUSE / openSUSE Security Updates · Apr 9, 2026
- SUSE-SU-2026:1042-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 26, 2026
- SUSE-SU-2026:0976-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Mar 25, 2026
- SUSE-SU-2026:0993-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Mar 25, 2026
- openSUSE-SU-2026:20342-1 Security update for go1.26 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0876-1 Security update for go1.26 SUSE / openSUSE Security Updates · Mar 13, 2026
- openSUSE-SU-2026:10299-1 go1.26-1.26.1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 8, 2026