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CVE-2026-33487— goxmldsig has validateSignature Loop Variable Capture Signature Bypass

Quick assessment

Affected
russellhaering goxmldsig
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

goxmldsig是Russell Haering个人开发者的一个Go语言编写的数字签名库。该库继承了 SAML2.0，不需要命令行工具即可进行签名的生成和验证功能。 goxmldsig 1.6.0之前版本存在安全漏洞，该漏洞源于validateSignature函数存在循环变量捕获问题，可能导致签名验证逻辑错误。

CVSS 7.5 · High EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
russellhaering goxmldsig < 1.6.0 affected
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I. Basic Information for CVE-2026-33487

Vulnerability Information
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Vulnerability Title
goxmldsig has validateSignature Loop Variable Capture Signature Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
goxmldsig 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
goxmldsig是Russell Haering个人开发者的一个Go语言编写的数字签名库。该库继承了 SAML2.0，不需要命令行工具即可进行签名的生成和验证功能。 goxmldsig 1.6.0之前版本存在安全漏洞，该漏洞源于validateSignature函数存在循环变量捕获问题，可能导致签名验证逻辑错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
russellhaering goxmldsig < 1.6.0 -

II. Public POCs for CVE-2026-33487

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III. Intelligence Information for CVE-2026-33487

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Vendor Advisories for CVE-2026-33487 (1)

IV. Related Vulnerabilities

Same product: goxmldsig
Same vendor: russellhaering
Same weakness: CWE-347

V. Comments for CVE-2026-33487

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