Description
A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Go toolchain | cmd/go | < 1.25.13, 1.26.0-0 – < 1.26.6, 1.27.0-0 – < 1.27.0-rc.3 | 1.25.13 |
| golang.org/x/mod | golang.org/x/mod/sumdb/tlog | < 0.40.0 | 0.40.0 |
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 | 1.26.6-1 | — |
| Debian 14 | golang-1.27 | 1.27~rc3-1 | — |
| Debian 13 | golang-1.24 | No fix yet | — |
| Debian 12 | golang-1.19 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | golang-1.23 +2 | No fix yet | — |
| Ubuntu 24.04 LTS | golang-1.21 +3 | No fix yet | — |
| Ubuntu 24.04 LTS | golang-1.22 | 1.22.2-2ubuntu0.5 | USN-8935-1 |
| Ubuntu 22.04 LTS | golang-1.17 +6 | No fix yet | — |
| Ubuntu 22.04 LTS | golang-1.22 | 1.22.2-2~22.04.4 | USN-8935-1 |
| Ubuntu 20.04 LTS | golang-1.13 +4 | No fix yet | — |
| Ubuntu 20.04 LTS | golang-1.22 | 1.22.2-2~20.04.3 | USN-8935-1 |
| Ubuntu 18.04 LTS | golang-1.8 +2 | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | golang-1.6 +1 | No fix yet | — |
| Ubuntu 14.04 LTS | golang-1.10 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | golang-1.13 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | golang-1.16 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | golang-1.13 +2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | golang-1.13 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLES 15 SP7 | go1.25-openssl | 1.25.14-150600.13.27.1 | SUSE-SU-2026:3815-1 |
| SLES 15 SP7 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLES 15 SP7 | go1.26-openssl | 1.26.7-150600.13.15.1 | SUSE-SU-2026:3816-1 |
| SLES 15 SP7 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
| SLES 15 SP6 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLES 15 SP6 | go1.25-openssl | 1.25.14-150600.13.27.1 | SUSE-SU-2026:3815-1 |
| SLES 15 SP6 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLES 15 SP6 | go1.26-openssl | 1.26.7-150600.13.15.1 | SUSE-SU-2026:3816-1 |
| SLES 15 SP6 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
| SLES 15 SP5 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLES 15 SP5 | go1.25-openssl | 1.25.14-150000.1.33.1 | SUSE-SU-2026:3800-1 |
| SLES 15 SP5 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLES 15 SP5 | go1.26-openssl | 1.26.7-150000.1.18.1 | SUSE-SU-2026:3799-1 |
| SLES 15 SP5 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
| SLES 15 SP4 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLES 15 SP4 | go1.25-openssl | 1.25.14-150000.1.33.1 | SUSE-SU-2026:3800-1 |
| SLES 15 SP4 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLES 15 SP4 | go1.26-openssl | 1.26.7-150000.1.18.1 | SUSE-SU-2026:3799-1 |
| SLES 15 SP4 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | go1.25 | 1.25.13-160000.1.1 | SUSE-SU-2026:23300-1 |
| SLES for SAP 16.0 | go1.25-openssl | 1.25.14-160000.1.1 | SUSE-SU-2026:23573-1 |
| SLES for SAP 16.0 | go1.26 | 1.26.6-160000.1.1 | SUSE-SU-2026:23301-1 |
| SLES for SAP 16.0 | go1.26-openssl | 1.26.7-160000.1.1 | SUSE-SU-2026:23576-1 |
| SLES for SAP 16.0 | govulncheck-vulndb | 0.0.20260827T195228-160000.1.1 | SUSE-SU-2026:23625-1 |
| SLES for SAP 16.0 | helm | 4.3.0-160000.1.1 | SUSE-SU-2026:23984-1 |
| SLES for SAP 15 SP6 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLES for SAP 15 SP6 | go1.25-openssl | 1.25.14-150600.13.27.1 | SUSE-SU-2026:3815-1 |
| SLES for SAP 15 SP6 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLES for SAP 15 SP6 | go1.26-openssl | 1.26.7-150600.13.15.1 | SUSE-SU-2026:3816-1 |
| SLES for SAP 15 SP6 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
| SLES for SAP 15 SP5 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLES for SAP 15 SP5 | go1.25-openssl | 1.25.14-150000.1.33.1 | SUSE-SU-2026:3800-1 |
| SLES for SAP 15 SP5 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLES for SAP 15 SP5 | go1.26-openssl | 1.26.7-150000.1.18.1 | SUSE-SU-2026:3799-1 |
| SLES for SAP 15 SP5 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
| SLES for SAP 15 SP4 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLES for SAP 15 SP4 | go1.25-openssl | 1.25.14-150000.1.33.1 | SUSE-SU-2026:3800-1 |
| SLES for SAP 15 SP4 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLES for SAP 15 SP4 | go1.26-openssl | 1.26.7-150000.1.18.1 | SUSE-SU-2026:3799-1 |
| SLES for SAP 15 SP4 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
| SLES 16.0 | go1.25 | 1.25.13-160000.1.1 | SUSE-SU-2026:23300-1 |
| SLES 16.0 | go1.25-openssl | 1.25.14-160000.1.1 | SUSE-SU-2026:23573-1 |
| SLES 16.0 | go1.26 | 1.26.6-160000.1.1 | SUSE-SU-2026:23301-1 |
| SLES 16.0 | go1.26-openssl | 1.26.7-160000.1.1 | SUSE-SU-2026:23576-1 |
| SLES 16.0 | govulncheck-vulndb | 0.0.20260827T195228-160000.1.1 | SUSE-SU-2026:23625-1 |
| SLES 16.0 | helm | 4.3.0-160000.1.1 | SUSE-SU-2026:23984-1 |
| SLE Micro 6.2 | helm | 4.3.0-160000.1.1 | SUSE-SU-2026:23973-1 |
| SLE Micro 6.1 | helm | 4.3.0-slfo.1.1_1.1 | SUSE-SU-2026:24282-1 |
| SLE HPC 15 SP5 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLE HPC 15 SP5 | go1.25-openssl | 1.25.14-150000.1.33.1 | SUSE-SU-2026:3800-1 |
| SLE HPC 15 SP5 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLE HPC 15 SP5 | go1.26-openssl | 1.26.7-150000.1.18.1 | SUSE-SU-2026:3799-1 |
| SLE HPC 15 SP5 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
| SLE HPC 15 SP4 | go1.25 | 1.25.13-150000.1.50.1 | SUSE-SU-2026:3640-1 |
| SLE HPC 15 SP4 | go1.25-openssl | 1.25.14-150000.1.33.1 | SUSE-SU-2026:3800-1 |
| SLE HPC 15 SP4 | go1.26 | 1.26.6-150000.1.24.1 | SUSE-SU-2026:3641-1 |
| SLE HPC 15 SP4 | go1.26-openssl | 1.26.7-150000.1.18.1 | SUSE-SU-2026:3799-1 |
| SLE HPC 15 SP4 | go1.27 | 1.27.0-150000.1.6.1 | SUSE-SU-2026:3830-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | go1.25 | 1.25.13-1.1 | openSUSE-SU-2026:11516-1 |
| openSUSE Tumbleweed | go1.26 | 1.26.6-1.1 | openSUSE-SU-2026:11517-1 |
| openSUSE Tumbleweed | go1.27 | 1.27rc3-1.1 | openSUSE-SU-2026:11536-1 |
| openSUSE Tumbleweed | helm | 4.2.4-1.1 | openSUSE-SU-2026:11575-1 |
| openSUSE Leap 16.0 | go1.25 | 1.25.13-160000.1.1 | openSUSE-SU-2026:21592-1 |
| openSUSE Leap 16.0 | go1.25-openssl | 1.25.14-160000.1.1 | openSUSE-SU-2026:21696-1 |
| openSUSE Leap 16.0 | go1.26 | 1.26.6-160000.1.1 | openSUSE-SU-2026:21593-1 |
| openSUSE Leap 16.0 | go1.26-openssl | 1.26.7-160000.1.1 | openSUSE-SU-2026:21705-1 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260827T195228-160000.1.1 | openSUSE-SU-2026:21761-1 |
| openSUSE Leap 16.0 | helm | 4.3.0-160000.1.1 | openSUSE-SU-2026:21983-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | go | 1.26.8-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | golang +6 | 1.26.7-1.amzn2023.0.1 | ALAS2023-2026-2114 |
| Amazon Linux 2 | golang +6 | 1.26.7-1.amzn2.0.1 | ALAS2-2026-3893 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | golang | 1.26.6-1 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | aactl | 0.4.12-r69 | — |
| Wolfi rolling | cert-manager-cainjector-1.20 | 1.20.3-r18 | — |
| Wolfi rolling | cilium-1.19-operator-generic | 1.19.7-r7 | — |
| Wolfi rolling | containerd-1 | 1.7.34-r6 | — |
| Wolfi rolling | ctr-2 +3 | 2.3.4-r2 | — |
| Wolfi rolling | dogstatsd-7.79 +1 | 7.79.2-r18 | — |
| Wolfi rolling | dogstatsd-7.80 | 7.80.4-r26 | — |
| Wolfi rolling | dogstatsd-7.81 +2 | No fix yet | — |
| Wolfi rolling | falco-no-driver | 0.44.1-r5 | — |
| Wolfi rolling | helm-3 | 3.22.0-r0 | — |
| Wolfi rolling | k3d | 5.9.0-r8 | — |
| Wolfi rolling | k3s +1 | 1.36.3.1-r2 | — |
| Wolfi rolling | k3s-1.32 +2 | 1.32.13.1-r26 | — |
| Wolfi rolling | k3s-1.34 +1 | 1.34.10.1-r2 | — |
| Wolfi rolling | k3s-1.35 +1 | 1.35.7.1-r2 | — |
| Wolfi rolling | kots | 1.131.2-r1 | — |
| Wolfi rolling | kyverno-1.17 | 1.17.2-r35 | — |
| Wolfi rolling | kyverno-1.18 +5 | 1.18.2-r8 | — |
| Wolfi rolling | kyverno-cli-1.17 +4 | 1.17.2-r29 | — |
| Wolfi rolling | mps-control-daemon +2 | 0.19.3-r7 | — |
| Wolfi rolling | nerdctl | 2.3.5-r5 | — |
| Wolfi rolling | renovate | 44.115.4-r0 | — |
| Wolfi rolling | snyk-cli | 1.1306.4-r1 | — |
| Wolfi rolling | spire-agent | 1.15.2-r6 | — |
| Wolfi rolling | trino | 483-r7 | — |
| Wolfi rolling | zot | 2.1.20-r2 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | golang.org/x/mod | < 0.40.0 | 0.40.0 | GO-2026-6179 |
| Go | toolchain | < 1.25.13 · >= 1.26.0-0, < 1.26.6 · >= 1.27.0-0, < 1.27.0-rc.3 | 1.25.13, 1.26.6, 1.27.0-rc.3 | GO-2026-6179 |
Advisories 29
- WID-SEC-2026-2850 Golang Go: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- SUSE-SU-2026:24282-1 Security update for helm SUSE / openSUSE Security Updates · Oct 27, 2026
- USN-8935-1 golang-1.22 vulnerabilities Ubuntu Security Notices (USN) · Oct 19, 2026
- SUSE-SU-2026:23984-1 Security update for helm SUSE / openSUSE Security Updates · Oct 6, 2026
- SUSE-SU-2026:23973-1 Security update for helm SUSE / openSUSE Security Updates · Oct 6, 2026
- openSUSE-SU-2026:21983-1 Security update for helm SUSE / openSUSE Security Updates · Oct 1, 2026
- SUSE-SU-2026:23625-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23573-1 Security update for go1.25-openssl SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23576-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23300-1 Security update for go1.25 SUSE / openSUSE Security Updates · Sep 10, 2026
- SUSE-SU-2026:23301-1 Security update for go1.26 SUSE / openSUSE Security Updates · Sep 10, 2026
- openSUSE-SU-2026:21761-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Sep 9, 2026
- SUSE-SU-2026:3830-1 Security update for go1.27 SUSE / openSUSE Security Updates · Aug 31, 2026
- SUSE-SU-2026:3816-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Aug 31, 2026
- SUSE-SU-2026:3815-1 Security update for go1.25-openssl SUSE / openSUSE Security Updates · Aug 31, 2026
- openSUSE-SU-2026:21705-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Aug 31, 2026
- openSUSE-SU-2026:21696-1 Security update for go1.25-openssl SUSE / openSUSE Security Updates · Aug 31, 2026
- ALAS2-2026-3893 Important: golang security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2114 Important: golang security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- SUSE-SU-2026:3799-1 Security update for go1.26-openssl SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:3800-1 Security update for go1.25-openssl SUSE / openSUSE Security Updates · Aug 27, 2026
- openSUSE-SU-2026:11575-1 helm-4.2.4-1.1 on GA media SUSE / openSUSE Security Updates · Aug 23, 2026
- openSUSE-SU-2026:21592-1 Security update for go1.25 SUSE / openSUSE Security Updates · Aug 21, 2026
- openSUSE-SU-2026:21593-1 Security update for go1.26 SUSE / openSUSE Security Updates · Aug 21, 2026
- openSUSE-SU-2026:11536-1 go1.27-1.27rc3-1.1 on GA media SUSE / openSUSE Security Updates · Aug 19, 2026
- SUSE-SU-2026:3640-1 Security update for go1.25 SUSE / openSUSE Security Updates · Aug 18, 2026
- SUSE-SU-2026:3641-1 Security update for go1.26 SUSE / openSUSE Security Updates · Aug 18, 2026
- openSUSE-SU-2026:11516-1 go1.25-1.25.13-1.1 on GA media SUSE / openSUSE Security Updates · Aug 16, 2026
- openSUSE-SU-2026:11517-1 go1.26-1.26.6-1.1 on GA media SUSE / openSUSE Security Updates · Aug 16, 2026