{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-40931",
        "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "state": "PUBLISHED",
        "assignerShortName": "CPANSec",
        "dateReserved": "2025-04-16T09:05:34.363Z",
        "datePublished": "2026-03-05T01:41:09.588Z",
        "dateUpdated": "2026-04-21T02:42:43.047Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "packageName": "Apache-Session",
                    "product": "Apache::Session::Generate::MD5",
                    "programFiles": [
                        "lib/Session/Generate/MD5.pm"
                    ],
                    "repo": "https://github.com/chorny/Apache-Session",
                    "vendor": "CHORNY",
                    "versions": [
                        {
                            "lessThanOrEqual": "1.94",
                            "status": "affected",
                            "version": "0",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id.\n\nApache::Session::Generate::MD5 generates session ids insecurely. The default session id generator returns a MD5 hash seeded with the built-in rand() function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predicable session ids could allow an attacker to gain access to systems.\n\nNote that the libapache-session-perl package in some Debian-based Linux distributions may be patched to use Crypt::URandom."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-115",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-115 Authentication Bypass"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-340",
                            "description": "CWE-340 Generation of Predictable Numbers or Identifiers",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-338",
                            "description": "CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
                "shortName": "CPANSec",
                "dateUpdated": "2026-04-12T17:19:38.170Z"
            },
            "references": [
                {
                    "url": "https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27"
                },
                {
                    "tags": [
                        "technical-description"
                    ],
                    "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
                },
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://github.com/chorny/Apache-Session/issues/4"
                },
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://rt.cpan.org/Ticket/Display.html?id=173631"
                },
                {
                    "tags": [
                        "mailing-list"
                    ],
                    "url": "https://www.openwall.com/lists/oss-security/2019/06/15/1"
                },
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930659"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://salsa.debian.org/perl-team/modules/packages/libapache-session-perl/-/commit/bdabd71c2f91b18526e31a9dc52b4c17b3d246b7#898a4b8b00022df1b8689910b67707f3e738d180"
                },
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/1633"
                },
                {
                    "url": "https://metacpan.org/pod/Apache::Session::Generate::Random"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Consider alternate solutions like https://metacpan.org/pod/Apache::Session::Generate::Random"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "timeline": [
                {
                    "lang": "en",
                    "time": "2017-10-06T00:00:00.000Z",
                    "value": "Issue created in the GitHub repository for Apache-Session identifying poor entropy."
                },
                {
                    "lang": "en",
                    "time": "2019-06-15T00:00:00.000Z",
                    "value": "Report posted to the Open Source Security mailing list."
                },
                {
                    "lang": "en",
                    "time": "2019-06-17T00:00:00.000Z",
                    "value": "Debian bug 930659 for libapache-session-perl poor source of entropy for session id generation."
                },
                {
                    "lang": "en",
                    "time": "2019-06-20T00:00:00.000Z",
                    "value": "Patch to use Crypt::URandom created by the Debian Perl Group."
                },
                {
                    "lang": "en",
                    "time": "2025-09-04T00:00:00.000Z",
                    "value": "Issue reported to CPANSec."
                },
                {
                    "lang": "en",
                    "time": "2026-03-05T00:00:00.000Z",
                    "value": "CVE disclosed by CPANSec."
                }
            ],
            "title": "Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id",
            "workarounds": [
                {
                    "lang": "en",
                    "value": "Apply the patch  from the Debian Perl Group that uses Crypt::URandom."
                }
            ],
            "x_generator": {
                "engine": "cpansec-cna-tool 0.1"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/03/05/3"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-03-05T11:12:52.118Z"
                }
            },
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 9.1,
                            "attackVector": "NETWORK",
                            "baseSeverity": "CRITICAL",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-05T16:38:07.301789Z",
                                "id": "CVE-2025-40931",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-04-21T02:42:43.047Z"
                }
            }
        ]
    }
}