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CVE-2026-33487

Goxmldsig vulnerability

7.5 HIGHPublic exploitEPSS 0.42%
  1. Published26 Mar 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

Goxmldsig< 1.6.0

Remediation

Fixed in
Goxmldsig≥ 1.6.0

References

and 2 more references

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Frequently asked

Is CVE-2026-33487 being actively exploited?

CVE-2026-33487 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-33487?

CVE-2026-33487 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-33487?

Affected products include Goxmldsig.

How do I fix CVE-2026-33487?

Upgrade affected software to a fixed version, for example Goxmldsig 1.6.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33487 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.