CVE-2026-2439
- Source
- https://cve.org/CVERecord?id=CVE-2026-2439
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2439.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-2439
- Published
- 2026-02-16T22:22:41.470Z
- Modified
- 2026-02-20T01:35:57.931274Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generatesessionid 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,
- 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.
- 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.
- UUIDs are identifiers whose mere possession grants access, as per RFC 9562.
- The output of the built-in rand() function is predictable and unsuitable for security applications.
- References
-
- https://metacpan.org/release/BVA/Concierge-Sessions-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5#lib/Concierge/Sessions/Base.pm
- https://perldoc.perl.org/5.42.0/functions/rand
- https://security.metacpan.org/docs/guides/random-data-for-security.html
- https://www.rfc-editor.org/rfc/rfc9562.html#name-security-considerations
- https://github.com/bwva/Concierge-Sessions/commit/20bb28e92e8fba307c4ff8264701c215be65e73b