Vulnerability-Lookup

CVE-2026-9487 (GCVE-0-2026-9487)

Vulnerability from cvelistv5 – Published: 2026-08-03 13:14 – Updated: 2026-08-03 19:59

Title

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

Summary

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.

Severity

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 19:59 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 63/100 over 297 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/perl-net-saml2/perl-XML-Sig/co…	patch
https://metacpan.org/release/TIMLEGGE/XML-Sig-0.7…	release-notes

Impacted products

1 product

Vendor	Product	Version	CPE status
TIMLEGGE	XML::Sig	Affected: 0 , < 0.71 (custom)	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-9487

Vulnerability from fkie_nvd - Published: 2026-08-03 14:16 - Updated: 2026-10-23 21:10

Severity

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/perl-net-saml2/perl-XML-Sig/commit/4976bde5245df69b8e02c6ae061acbd4891cd7f9.patch	Patch
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/TIMLEGGE/XML-Sig-0.71/source/Changes	Release Notes

Impacted products

	Vendor	Product	Version
	xml\	\	sig_project

JSON

To clipboard

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          "collectionURL": "https://cpan.org/modules",
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          "value": "CWE-347"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-WQP7-2WW4-Q6MF

Vulnerability from github – Published: 2026-08-03 15:32 – Updated: 2026-08-03 21:31

Details

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.

Severity

9.1 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-9487"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-03T14:16:31Z",
    "severity": "CRITICAL"
  },
  "details": "XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID.\n\n_get_signed_xml() in lib/XML/Sig.pm, called from verify(), resolves the SignedInfo Reference/@URI to a node with the XPath expression \"//*[@ID=\u0027$id\u0027]\" 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.\n\nSuch 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.",
  "id": "GHSA-wqp7-2ww4-q6mf",
  "modified": "2026-08-03T21:31:35Z",
  "published": "2026-08-03T15:32:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9487"
    },
    {
      "type": "WEB",
      "url": "https://github.com/perl-net-saml2/perl-XML-Sig/commit/4976bde5245df69b8e02c6ae061acbd4891cd7f9.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/TIMLEGGE/XML-Sig-0.71/source/Changes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-9487 (GCVE-0-2026-9487)

FKIE_CVE-2026-9487

GHSA-WQP7-2WW4-Q6MF

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