XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-9487
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-03 14:16:31 UTC
Updated2026-08-05 14:57:50 UTC
DescriptionXML::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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.001670000 probability, percentile 0.062960000 (date 2026-08-09)

Problem Types: CWE-347 | CWE-347 CWE-347 Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Xml sig_project xml\ \ sig

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TIMLEGGE XMLSig affected 0.71 custom Not specified

References

ReferenceSourceLinkTags
github.com/perl-net-saml2/perl-XML-Sig/commit/4976bde5245df69b8e02c6ae06... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Patch
metacpan.org/release/TIMLEGGE/XML-Sig-0.71/source/Changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to version 0.71

Workarounds

CNA: Signing the outermost <samlp:Response> element rather than only the inner <saml:Assertion> reduces exposure, but does not prevent wrapping variants in which the duplicate ID is introduced outside the signed element. Upgrading to 0.71 is the complete fix.

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