russellhaering goxmldsig up to 1.5.x XML Digital Signature validateSignature signature verification

Summaryinfo

A vulnerability has been found in russellhaering goxmldsig up to 1.5.x and classified as problematic. This affects the function validateSignature of the component XML Digital Signature Handler. Performing a manipulation results in signature verification. This vulnerability is known as CVE-2026-33487. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in russellhaering goxmldsig up to 1.5.x. This affects the function validateSignature of the component XML Digital Signature Handler. The manipulation with an unknown input leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-33487 since 03/20/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 304089 (Linux Distros Unpatched Vulnerability : CVE-2026-33487), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.6.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (304089). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• russellhaering

Name

• goxmldsig

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5

Website

• Product: https://github.com/russellhaering/goxmldsig/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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