CVE-2026-33487
goxmldsig has validateSignature Loop Variable Capture Signature Bypass
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.
INFO
Published Date :
March 26, 2026, 6:16 p.m.
Last Modified :
July 9, 2026, 1:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
- Update goxmlsig to version 1.6.0 or later.
- Review loop variable handling in reference validation.
- Ensure correct reference matching logic.
Public PoC/Exploit Available at Github
CVE-2026-33487 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33487.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33487 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33487
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Personal Bio README
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33487 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33487 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 09, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:36882 Changed Affected [{'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.3::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.3.4', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.4::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.4.5', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.5::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.5.4', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.6::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.6.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.15::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.15', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_gitops:1.18::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift GitOps 1.18', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_gitops:1.19::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift GitOps 1.19', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:advanced_cluster_security:4'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Security 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 10', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:9'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 9', 'defaultStatus': 'unaffected'}] [{'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.3::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.3.4', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.4::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.4.5', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.5::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.5.4', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.6::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.6.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.14::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.14', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.15::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.15', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_gitops:1.18::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift GitOps 1.18', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_gitops:1.19::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift GitOps 1.19', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:advanced_cluster_security:4'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Security 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 10', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:9'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 9', 'defaultStatus': 'unaffected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.3::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.3.4', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.4::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.4.5', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.5::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.5.4', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_globalhub:1.6::el9'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub 1.6.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2.15::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2.15', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_gitops:1.18::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift GitOps 1.18', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_gitops:1.19::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift GitOps 1.19', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:advanced_cluster_security:4'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Security 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 10', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:9'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 9', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CWE CWE-347 Added Reference https://access.redhat.com/errata/RHSA-2026:13548 Added Reference https://access.redhat.com/errata/RHSA-2026:20943 Added Reference https://access.redhat.com/errata/RHSA-2026:20946 Added Reference https://access.redhat.com/errata/RHSA-2026:21769 Added Reference https://access.redhat.com/errata/RHSA-2026:22347 Added Reference https://access.redhat.com/errata/RHSA-2026:22423 Added Reference https://access.redhat.com/errata/RHSA-2026:23345 Added Reference https://access.redhat.com/security/cve/CVE-2026-33487 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2451814 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33487.json -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'russellhaering', 'product': 'goxmldsig', 'versions': [{'status': 'affected', 'version': '< 1.6.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-33487', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-03-30T11:16:13.379400Z'} -
Initial Analysis by [email protected]
Apr. 20, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:goxmldsig_project:goxmldsig:*:*:*:*:*:*:*:* versions up to (excluding) 1.6.0 Added Reference Type GitHub, Inc.: https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-479m-364c-43vc Types: Exploit, Mitigation, Vendor Advisory -
New CVE Received by [email protected]
Mar. 26, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CWE CWE-682 Added CWE CWE-347 Added Reference https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-479m-364c-43vc