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Public proof of conceptFix available

CVE-2026-33487

A public proof of concept exists; no exploitation attested.

  • Published2026-03-26
  • Fixed in1.6.0
  • WeaknessCWE-347 · CWE-682

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-03-2618:16CVE publishedNVD

Versions per branch

NVD · OSV
Goxmldsig project goxmldsig
BranchAffectedFixed in
1.6< 1.6.01.6.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • russellhaering goxmldsig
    Affected
    • = < 1.6.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-26

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • commercial-grafana-11.6Chainguardall versions · fixed in 11.6.14-r0
  • commercial-grafana-12.1Chainguardall versions · fixed in 12.1.10-r0
  • commercial-grafana-12.2Chainguardall versions · fixed in 12.2.8-r0
  • commercial-grafana-12.3Chainguardall versions · fixed in 12.3.6-r0
  • commercial-grafana-12.4Chainguardall versions · fixed in 12.4.2-r0
  • dexWolfiall versions · fixed in 2.45.1-r4
  • dexMinimOSall versions · fixed in 2.45.1-r2and 3 other packages
  • dexCleanStartall versions · fixed in 2.42.1-r4

50 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-33487 Red Hat Product Security32 products fixed

    github.com/russellhaering/goxmldsig: goxmlsig: Integrity bypass due to incorrect XML Digital Signature validation via loop variable capture issue

  • RHSA-2026:36882 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.14.3 security update

  • RHSA-2026:23345 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Multicluster Global Hub 1.6.2 security update

  • RHSA-2026:22423 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Multicluster Global Hub 1.3.4 security update

  • RHSA-2026:22347 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Multicluster Global Hub 1.4.5 security update

  • RHSA-2026:21769 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Multicluster Global Hub 1.5.4 security update

3 more advisories

Full record on NVD

Fix

  1. Update Goxmldsig project goxmldsig to 1.6.0
  2. Vendor fix Red Hat Product Security RHSA-2026:36882 · 4 productsBefore you apply this update, make sure all previously released errata that are relevant to your system are applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:23345 · 4 productsFor more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.15/html/multicluster_global_hub/index
  4. Vendor fix Red Hat Product Security RHSA-2026:22423 · 4 productsFor more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.12/html/multicluster_global_hub/index
  5. Vendor fix Red Hat Product Security RHSA-2026:22347 · 4 productsFor more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.13/html/multicluster_global_hub/index
  6. Vendor fix Red Hat Product Security RHSA-2026:21769 · 4 productsFor more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.14/html/multicluster_global_hub/index
  7. Vendor fix Red Hat Product Security RHSA-2026:20946 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-03-30
  • CNACVSS 3.17.5known since 2026-10-23
  • CNAweakness (CWE)CWE-347, CWE-682known since 2026-10-23
  • FIRST EPSSEPSS score0.3 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-03-18

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
2026-03-26
Last Modified
2026-09-09
NVD status
Modified
GitHub Advisory
GHSA-479m-364c-43vc

Frequently asked questions

What is CVE-2026-33487?

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.

Is CVE-2026-33487 actively exploited?

A proof-of-concept exploit exists for CVE-2026-33487, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-33487?

CVE-2026-33487 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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