{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-3256","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","state":"PUBLISHED","assignerShortName":"CPANSec","dateReserved":"2026-02-26T11:59:23.755Z","datePublished":"2026-03-28T18:52:39.917Z","dateUpdated":"2026-06-29T06:50:16.274Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"http-session","product":"HTTP::Session","programRoutines":[{"name":"HTTP::Session::ID::SHA1::generate_id"},{"name":"HTTP::Session::ID::MD5::generate_id"}],"repo":"https://github.com/tokuhirom/http-session","vendor":"KTAT","versions":[{"lessThan":"0.54","status":"affected","version":"0","versionType":"custom"}]}],"descriptions":[{"lang":"en","value":"HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids.\n\nHTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution 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\nThe distribution includes HTTP::session::ID::MD5 which contains a similar flaw, but uses the MD5 hash instead."}],"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":"2026-06-29T06:50:16.274Z"},"references":[{"url":"https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pm"},{"url":"https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pm"},{"tags":["technical-description"],"url":"https://security.metacpan.org/docs/guides/random-data-for-security.html"},{"tags":["release-notes"],"url":"https://metacpan.org/release/TOKUHIROM/http-session-0.54/changes"}],"solutions":[{"lang":"en","value":"Upgrade to version 0.54 or later.\n\nNote that HTTP::Session as of version 0.54 is deprecated. Users should migrate their applications to alternative solutions."}],"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2026-03-28T00:00:00.000Z","value":"CVE-2026-3256 published"},{"lang":"en","time":"2026-06-27T00:00:00.000Z","value":"HTTP::Session version 0.54 released"}],"title":"HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids","x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/03/28/5"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-03-28T20:06:47.537Z"}},{"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":"2026-04-01T14:14:27.526725Z","id":"CVE-2026-3256","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":"2026-04-01T14:14:51.886Z"}}]}}