{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-86219",
        "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "state": "PUBLISHED",
        "assignerShortName": "CPANSec",
        "dateReserved": "2026-09-06T00:13:35.358Z",
        "datePublished": "2026-09-06T17:46:30.340Z",
        "dateUpdated": "2026-09-06T17:46:30.340Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "modules": [
                        "Authen::SASL::Perl::DIGEST_MD5"
                    ],
                    "packageName": "Authen-SASL",
                    "packageURL": "pkg:cpan/Authen-SASL",
                    "programFiles": [
                        "lib/Authen/SASL/Perl/DIGEST_MD5.pm"
                    ],
                    "programRoutines": [
                        {
                            "name": "Authen::SASL::Perl::DIGEST_MD5::server_step"
                        },
                        {
                            "name": "Authen::SASL::Perl::DIGEST_MD5::server_start"
                        }
                    ],
                    "repo": "https://github.com/perl-authen-sasl/perl-authen-sasl",
                    "versions": [
                        {
                            "lessThan": "2.2100",
                            "status": "affected",
                            "version": "0",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step.\n\nserver_start generates a fresh nonce and sends it in the challenge, and nothing later compares that value against the nonce the client returns. server_step derives the expected digest from the client's own parameters, so a response verifies whenever its digest matches the nonce it carries. The count table it also checks is keyed on the client-supplied nonce and starts empty in each new server object, so a captured first response, carrying `nc=00000001`, passes that too. RFC 2831 defines the nonce in the response as the value the server sent in the preceding challenge.\n\nAn attacker who observes one successful `qop=auth` exchange can replay the captured response against a later session for the same service, host, realm and user, and authenticate as that user without knowing the password."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-115",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-115 Authentication Bypass"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-294",
                            "description": "CWE-294 Authentication Bypass by Capture-replay",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
                "shortName": "CPANSec",
                "dateUpdated": "2026-09-06T17:46:30.340Z"
            },
            "references": [
                {
                    "url": "https://metacpan.org/release/EHUELS/Authen-SASL-2.2000/source/lib/Authen/SASL/Perl/DIGEST_MD5.pm#L203-222"
                },
                {
                    "url": "https://metacpan.org/release/EHUELS/Authen-SASL-2.2000/source/lib/Authen/SASL/Perl/DIGEST_MD5.pm#L410-414"
                },
                {
                    "url": "https://datatracker.ietf.org/doc/html/rfc2831#section-2.1.2"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/perl-authen-sasl/perl-authen-sasl/commit/94337367030612842924f697cead29964a96448d.patch"
                },
                {
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://metacpan.org/release/EHUELS/Authen-SASL-2.2100/changes"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://www.cve.org/CVERecord?id=CVE-2025-40918"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Upgrade to Authen-SASL 2.2100 or later."
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step",
            "x_generator": {
                "engine": "cpansec-cna-tool 0.1"
            }
        }
    }
}