{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-56016", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-06-18T11:27:09.117Z", "datePublished": "2026-07-01T06:46:23.589Z", "dateUpdated": "2026-07-01T17:36:49.480Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "CGI-Session", "product": "CGI::Session::ID::md5", "programFiles": ["lib/CGI/Session/ID/md5.pm"], "programRoutines": [{"name": "CGI::Session::ID::md5::generate_id"}], "repo": "http://github.com/cromedome/cgi-session", "vendor": "MARKSTOS", "versions": [{"lessThan": "4.49", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources.\n\nThe generate_id method builds the session id from a MD5 digest of the process id, the epoch time, and the built-in rand() function. All three are predictable, low-entropy sources: the PID is drawn from a small range, the epoch time can be guessed or read from the HTTP Date header, and Perl's rand() is unsuitable for security purposes because it is predictable and reversible.\n\nAn attacker who predicts a session id can impersonate the corresponding session and bypass authentication."}], "impacts": [{"capecId": "CAPEC-59", "descriptions": [{"lang": "en", "value": "CAPEC-59 Session Credential Falsification through Prediction"}]}, {"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": "2026-07-01T06:46:23.589Z"}, "references": [{"tags": ["release-notes"], "url": "https://metacpan.org/release/MARKSTOS/CGI-Session-4.49/changes"}, {"tags": ["related"], "url": "https://metacpan.org/release/MARKSTOS/CGI-Session-4.49/source/lib/CGI/Session/ID/md5.pm"}], "solutions": [{"lang": "en", "value": "Upgrade to CGI::Session 4.49 or later, which generates session ids from Crypt::SysRandom."}], "source": {"discovery": "UNKNOWN"}, "timeline": [{"lang": "en", "time": "2026-06-30T00:00:00.000Z", "value": "Version 4.49 released with fix."}], "title": "CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources", "x_generator": {"engine": "cpansec-cna-tool 0.1"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-07-01T14:03:10.013809Z", "id": "CVE-2026-56016", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-07-01T14:03:16.730Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/07/01/6"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-07-01T17:36:49.480Z"}}]}}

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{}

{"bugzilla": {"description": "perl-CGI-Session: perl-CGI-Session: Authentication bypass via predictable session IDs", "id": "2495858", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495858"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-331", "details": ["A flaw was found in perl-CGI-Session. This vulnerability allows a remote attacker to predict session identifiers due to the use of low-entropy sources in the `generate_id` method. By predicting a session identifier, an attacker can impersonate a user's session, leading to a bypass of authentication mechanisms and potential unauthorized access to sensitive information or functionality."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-56016", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "perl-CGI-Session", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "perl-CGI-Session", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2026-07-01T06:46:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-56016\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-56016\nhttps://metacpan.org/release/MARKSTOS/CGI-Session-4.49/changes\nhttps://metacpan.org/release/MARKSTOS/CGI-Session-4.49/source/lib/CGI/Session/ID/md5.pm"], "statement": "This Important flaw in perl-CGI-Session allows a remote attacker to bypass authentication by predicting session identifiers. The `CGI::Session::ID::md5` module generates session IDs using low-entropy sources, including process ID, epoch time, and a predictable random number generator. This predictability enables an attacker to impersonate a user's session, potentially leading to unauthorized access in web applications utilizing this module for session management.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,4.49)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "CGI::Session::ID::md5", "source": "cna", "vendor": "MARKSTOS"}, "product": "cgi::session::id::md5", "vendor": "markstos"}], "created": "2026-07-01T15:15:04.129466+00:00", "updated": "2026-07-08T02:45:03.740604+00:00", "vendors": ["markstos", "markstos$PRODUCT$cgi::session::id::md5"]}