CVE-2026-33487 — goxmldsig has validateSignature Loop Variable Capture Signature Bypass

Affected: russellhaering goxmldsig, Red Hat Multicluster Global Hub 1.3.4, Red Hat Multicluster Global Hub 1.4.5, Red Hat Multicluster Global Hub 1.6.5, Red Hat Advanced Cluster Management for Kubernetes 2.14, Red Hat Advanced Cluster Management for Kubernetes 2.15, Red Hat multicluster global hub 1.5.3, Red Hat OpenShift GitOps 1.18, Red Hat OpenShift GitOps 1.19, Red Hat Advanced Cluster Security 4 and 3 more

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.

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CVE-2026-33487 — goxmldsig has validateSignature Loop Variable Capture Signature Bypass