goxmldsig has validateSignature Loop Variable Capture Signature Bypass
Priority HIGH 72CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-347.
Summary
goxmlsig provides XML Digital Signatures implemented in Go. Prior to version 1.6.0, the `validateSignature` function in `validate.go` goes through the references in the `SignedInfo` block to find one that matches the signed element's ID. In Go versions before 1.22, or when `go.mod` uses an older version, there is a loop variable capture issue. The code takes the address of the loop variable `_ref` instead of its value. As a result, if more than one reference matches the ID or if the loop logic is incorrect, the `ref` pointer will always end up pointing to the last element in the `SignedInfo.References` slice after the loop. goxmlsig version 1.6.0 contains a patch.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00322 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed goxmldsig (russellhaering): 1.6.0github.com/russellhaering/goxmldsig (Go): 1.6.0Red Hat: 8 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| russellhaering | goxmldsig | before 1.6.0 | 1.6.0 | Patch available | CNA |
| — | github.com/russellhaering/goxmldsig (Go) | before 1.6.0 | 1.6.0 | Patch available | GHSA-479m-364c-43vc |
- goxmldsig Vendorrussellhaering Affected before 1.6.0 Fixed in 1.6.0 Patch available CNA
- github.com/russellhaering/goxmldsig (Go) Vendor— Affected before 1.6.0 Fixed in 1.6.0 Patch available GHSA-479m-364c-43vc
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:goxmldsig_project:goxmldsig:*:*:*:*:*:*:*:* | before 1.6.0 | Vulnerable | Goxmldsig Project |
- cpe:2.3:a:goxmldsig_project:goxmldsig:*:*:*:*:*:*:*:* Versions before 1.6.0 Vulnerable ·Goxmldsig Project
Remediation
- Fix · CNA goxmldsig (russellhaering) Fixed in 1.6.0
- Fix · GHSA-479m-364c-43vc github.com/russellhaering/goxmldsig (Go) Fixed in 1.6.0 Advisory →
Red Hat 8 advisories
- RHSA-2026:36882 Released 2026-07-08 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.14.3 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.14 registry.redhat.io/rhacm2/acm-cli-rhel9, registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-governance-policy-framework-addon-rhel9 +10
- RHSA-2026:23345 Released 2026-06-04 · Red Hat rating ImportantMulticluster Global Hub 1.6.2 security update
- Multicluster Global Hub 1.6.6 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
- RHSA-2026:22423 Released 2026-06-02 · Red Hat rating ImportantMulticluster Global Hub 1.3.4 security update
- Multicluster Global Hub 1.3.4 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
Show 5 more Red Hat advisories
- RHSA-2026:22347 Released 2026-06-01 · Red Hat rating ImportantMulticluster Global Hub 1.4.5 security update
- Multicluster Global Hub 1.4.9 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
- RHSA-2026:21769 Released 2026-05-28 · Red Hat rating ImportantMulticluster Global Hub 1.5.4 security update
- Multicluster Global Hub 1.5.8 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
- RHSA-2026:20946 Released 2026-05-26 · Red Hat rating ImportantRed Hat OpenShift GitOps v1.18.6 security update
- Red Hat OpenShift GitOps 1.18 registry.redhat.io/openshift-gitops-1/console-plugin-rhel8, registry.redhat.io/openshift-gitops-1/dex-rhel8, registry.redhat.io/openshift-gitops-1/gitops-rhel8
- RHSA-2026:20943 Released 2026-05-26 · Red Hat rating ImportantRed Hat OpenShift GitOps v1.19.4 security update
- Red Hat OpenShift GitOps 1.19 registry.redhat.io/openshift-gitops-1/argocd-image-updater-rhel8, registry.redhat.io/openshift-gitops-1/console-plugin-rhel8, registry.redhat.io/openshift-gitops-1/dex-rhel8 +1
- RHSA-2026:13548 Released 2026-05-04 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.15.2 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.15 registry.redhat.io/rhacm2/acm-cli-rhel9, registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-governance-policy-framework-addon-rhel9 +8
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Multicluster Global Hub 1.3.4 | Fixed | RHSA-2026:22423 |
| Multicluster Global Hub 1.4.9 | Fixed | RHSA-2026:22347 |
| Multicluster Global Hub 1.5.8 | Fixed | RHSA-2026:21769 |
| Multicluster Global Hub 1.6.6 | Fixed | RHSA-2026:23345 |
| Red Hat Advanced Cluster Management for Kubernetes 2.14 | Fixed | RHSA-2026:36882 |
| Red Hat Advanced Cluster Management for Kubernetes 2.15 | Fixed | RHSA-2026:13548 |
| Red Hat OpenShift GitOps 1.18 | Fixed | RHSA-2026:20946 |
| Red Hat OpenShift GitOps 1.19 | Fixed | RHSA-2026:20943 |
Not affected: 12 products
- Multicluster Global Hub 1.3.4
- Multicluster Global Hub 1.4.9
- Multicluster Global Hub 1.5.8
- Multicluster Global Hub 1.6.6
- Red Hat Advanced Cluster Management for Kubernetes 2.14
- Red Hat Advanced Cluster Management for Kubernetes 2.15
- Red Hat Advanced Cluster Security 4
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift GitOps 1.18
- Red Hat OpenShift GitOps 1.19
Timeline
- 2026-10-02 Threatist record created from CVE-2026-33487
- 2026-10-03 Alias added: GHSA-479m-364c-43vc
- 2026-10-31 Fix available: Multicluster Global Hub 1.5.8, Multicluster Global Hub 1.6.6 · Red Hat
References
More Goxmldsig Project Goxmldsig vulnerabilities
- TI-2020-06231 Denial of service (DoS) in github.com/russellhaering/goxmldsig CVSS 3.1HIGH 7.5
- TI-2020-11988 Signature Validation Bypass in goxmldsig CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-33487 · CVE Program
- CVE-2026-33487 · NVD
- FIRST EPSS
- GHSA-479m-364c-43vc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-33487 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences