{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-18568",
        "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "state": "PUBLISHED",
        "assignerShortName": "CPANSec",
        "dateReserved": "2026-08-02T00:59:21.745Z",
        "datePublished": "2026-08-03T14:38:52.540Z",
        "dateUpdated": "2026-08-03T20:05:52.443Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "packageName": "XML-Sig",
                    "product": "XML::Sig",
                    "programFiles": [
                        "lib/XML/Sig.pm"
                    ],
                    "programRoutines": [
                        {
                            "name": "XML::Sig::verify"
                        }
                    ],
                    "repo": "https://github.com/perl-net-saml2/perl-XML-Sig",
                    "vendor": "TIMLEGGE",
                    "versions": [
                        {
                            "lessThan": "0.72",
                            "status": "affected",
                            "version": "0.29",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "XML::Sig versions from 0.29 before 0.72 for Perl allow signature verification bypass because verify returns true when every signature was skipped before any cryptographic check.\n\nverify in lib/XML/Sig.pm counts the `//dsig:Signature` elements into `$numsigs` and iterates over them, but two paths reach `next` before any digest or key check runs: a `SignedInfo/Reference/@URI` that resolves to no element while `$numsigs` is greater than 1, and, when `id_attr` is set, a reference that does not match the requested ID. The loop records nothing about what it checked, so when every signature takes one of those paths control reaches the unconditional `return 1` that ends verify. Two `Signature` elements whose Reference URI names an ID that no element carries is enough, as is one such element combined with `id_attr`.\n\nAny caller that passes untrusted XML to verify can receive a true return for a document in which no digest and no signature value was checked; a `cert` or `cert_text` trust anchor does not change this, because no key check runs. Versions up to 0.28 use an XML::XPath based verify that has no such skip and are not affected."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-347",
                            "description": "CWE-347 Improper Verification of Cryptographic Signature",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
                "shortName": "CPANSec",
                "dateUpdated": "2026-08-03T14:38:52.540Z"
            },
            "references": [
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/perl-net-saml2/perl-XML-Sig/commit/ef22cfed1ac0f29b316d17eb79cf6480e03ae16a.patch"
                },
                {
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://metacpan.org/release/TIMLEGGE/XML-Sig-0.72/changes"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://www.cve.org/CVERecord?id=CVE-2025-40934"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Upgrade to XML::Sig 0.72 or later, which returns false when no reference digest was checked and matched."
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "timeline": [
                {
                    "lang": "en",
                    "time": "2026-08-03T00:00:00.000Z",
                    "value": "Version 0.72 released with fix."
                }
            ],
            "title": "XML::Sig versions from 0.29 before 0.72 for Perl allow signature verification bypass because verify returns true when every signature was skipped before any cryptographic check",
            "x_generator": {
                "engine": "cpansec-cna-tool 0.1"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 7.5,
                            "attackVector": "NETWORK",
                            "baseSeverity": "HIGH",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "NONE"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-03T20:05:13.814301Z",
                                "id": "CVE-2026-18568",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-03T20:05:52.443Z"
                }
            }
        ]
    }
}