{"id":"CVE-2026-2439","summary":"Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids","details":"Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl's built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically,\n\n  *  There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason.\n  *  The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses.\n  *  UUIDs are identifiers whose mere possession grants access, as per RFC 9562.\n  *  The output of the built-in rand() function is predictable and unsuitable for security applications.","modified":"2026-08-12T03:51:10.917783902Z","published":"2026-02-16T21:25:21.091Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2439.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.8.1"},{"fixed":"0.8.5"}]},{"extracted_events":[{"introduced":"0.8.1"},{"fixed":"0.8.5"}],"source":"DESCRIPTION"}],"cna_assigner":"CPANSec","cwe_ids":["CWE-338","CWE-340"]},"references":[{"type":"WEB","url":"https://cpan.org/modules"},{"type":"WEB","url":"https://metacpan.org/release/BVA/Concierge-Sessions-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5#lib/Concierge/Sessions/Base.pm"},{"type":"WEB","url":"https://perldoc.perl.org/5.42.0/functions/rand"},{"type":"WEB","url":"https://security.metacpan.org/docs/guides/random-data-for-security.html"},{"type":"WEB","url":"https://www.rfc-editor.org/rfc/rfc9562.html#name-security-considerations"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2439.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2439"},{"type":"FIX","url":"https://github.com/bwva/Concierge-Sessions/commit/20bb28e92e8fba307c4ff8264701c215be65e73b"},{"type":"PACKAGE","url":"https://github.com/bwva/Concierge-Sessions"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bwva/concierge-sessions","events":[{"introduced":"0"},{"fixed":"20bb28e92e8fba307c4ff8264701c215be65e73b"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2439.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}