{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40926","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","state":"PUBLISHED","assignerShortName":"CPANSec","dateReserved":"2025-04-16T09:05:34.362Z","datePublished":"2026-03-05T01:24:34.151Z","dateUpdated":"2026-04-21T02:42:17.296Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"Plack-Middleware-Session-Simple","product":"Plack::Middleware::Session::Simple","programFiles":["lib/Plack/Middleware/Session/Simple.pm"],"programRoutines":[{"name":"Plack::Middleware::Session::Simple::sid_generator"}],"repo":"https://github.com/kazeburo/Plack-Middleware-Session-Simple","vendor":"KAZEBURO","versions":[{"lessThan":"0.05","status":"affected","version":"0","versionType":"custom"}]}],"descriptions":[{"lang":"en","value":"Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely.\n\nThe default session id generator returns a SHA-1 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.\n\nPredictable session ids could allow an attacker to gain access to systems.\n\nPlack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923."}],"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":"2026-03-11T23:25:24.779Z"},"references":[{"url":"https://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.04/source/lib/Plack/Middleware/Session/Simple.pm#L43"},{"tags":["issue-tracking"],"url":"https://github.com/kazeburo/Plack-Middleware-Session-Simple/pull/4"},{"tags":["patch"],"url":"https://github.com/kazeburo/Plack-Middleware-Session-Simple/commit/760bb358b8f53e52cf415888a4ac858fd99bb24e.patch"},{"tags":["vendor-advisory","related","vdb-entry"],"url":"https://www.cve.org/CVERecord?id=CVE-2025-40923"},{"tags":["technical-description"],"url":"https://security.metacpan.org/docs/guides/random-data-for-security.html"},{"tags":["release-notes"],"url":"https://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.05/changes"}],"solutions":[{"lang":"en","value":"Users are advised to upgrade to version 0.05 or later."}],"source":{"discovery":"UNKNOWN"},"title":"Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely","workarounds":[{"lang":"en","value":"Users are advised to change the sid_generator attribute of Plack::Middleware::Session::Simple to a function that returns a securely generated session id based on a secure source of entropy from the system.\n\nUsers may consider using Plack::Middleware::Session version 0.35 or later."}],"x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-03-05T16:28:14.069463Z","id":"CVE-2025-40926","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":"2026-04-21T02:42:17.296Z"}}]}}