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CVE-2026-9487— XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID

Quick assessment

Affected
TIMLEGGE XML::Sig
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.

timlegge XML::Sig是timlegge个人开发者的一款处理XML数字签名的Perl模块。 TIMLEGGE XML::Sig 0.71之前版本存在加密问题漏洞，该漏洞源于使用XPath表达式解析SignedInfo Reference/@URI时仅返回第一个匹配节点，未检测重复ID，导致签名包装攻击，在SAML2上下文中可能使断言内容受攻击者控制。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.28% · P18

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass

Affected Version Matrix 1

VendorProduct Version RangeStatus
TIMLEGGE XML::Sig < 0.71 affected
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I. Basic Information for CVE-2026-9487

Vulnerability Information
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Vulnerability Title
XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID
Source: CVE Program / CVE List V5
Vulnerability Description
XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID. _get_signed_xml() in lib/XML/Sig.pm, called from verify(), resolves the SignedInfo Reference/@URI to a node with the XPath expression "//*[@ID='$id']" and returns the first node of the resulting node set. A document in which two elements share that ID value is accepted: the digest and signature are checked against whichever element comes first in document order, and the duplicate is not detected. Such a document verifies successfully while an application that resolves the same ID independently can read the second, attacker supplied element; in a SAML2 context this places the contents of an Assertion under attacker control.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
TIMLEGGE XML::Sig 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
timlegge XML::Sig是timlegge个人开发者的一款处理XML数字签名的Perl模块。 TIMLEGGE XML::Sig 0.71之前版本存在加密问题漏洞，该漏洞源于使用XPath表达式解析SignedInfo Reference/@URI时仅返回第一个匹配节点，未检测重复ID，导致签名包装攻击，在SAML2上下文中可能使断言内容受攻击者控制。
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
TIMLEGGE XML::Sig 0 ~ 0.71 -

II. Public POCs for CVE-2026-9487

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III. Intelligence Information for CVE-2026-9487

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Patches & Fixes for CVE-2026-9487 (2)

Same Patch Batch · TIMLEGGE · 2026-08-03 · 6 CVEs total

CVE-2026-18108 Net::SAML2 versions before 0.86 for Perl allow authentication bypass because _verify_encry
CVE-2026-18092 Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass via XML signatur
CVE-2026-18089 Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass by verifying res
CVE-2026-9390 XML::Sig versions before 0.71 for Perl allow XPath injection in ID lookup
CVE-2026-18568 XML::Sig versions from 0.29 before 0.72 for Perl allow signature verification bypass becau

IV. Related Vulnerabilities

Same product: XML::Sig
Same vendor: TIMLEGGE
Same weakness: CWE-347

V. Comments for CVE-2026-9487

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