# CVE-2026-33487

## Summary

- **CVE ID:** CVE-2026-33487
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-347, CWE-682
- **Published:** Mar 26, 2026
- **Last Modified:** Sep 9, 2026

## Description

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.

## Affected Products

- russellhaering — goxmldsig (< 1.6.0)

## References

- [CNA](https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-479m-364c-43vc)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-33487)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2451814)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33487.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:22423)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:22347)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:21769)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:23345)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:13548)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:20946)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:20943)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36882)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._