Insecure Session ID Generation in Concierge::Sessions by BVA
CVE-2026-2439

9.8CRITICAL

Key Information:

Vendor

Bva

Status
Concierge::sessions
Vendor
CVE Published:
16 February 2026

What is CVE-2026-2439?

Concierge::Sessions versions prior to 0.8.5 exhibit a vulnerability where insecure session IDs are generated. The method for generating session IDs relies on uuidgen, which can fail silently and revert to using Perl's rand() function. This fallback poses a significant risk as the built-in rand() function provides predictable outputs unsuitable for secure applications. Additionally, if the uuidgen command does not receive a high-quality random number source, time-based UUIDs may be generated, exposing session IDs to potential guessing attacks. This flaw grants attackers access to systems by compromising session identifiers. Proper attention to secure random number generation is essential to mitigate these risks.

Affected Version(s)

Concierge::Sessions 0.8.1 < 0.8.5

References

https://metacpan.org/release/BVA/Concierge-Sessions-v0.8....
related
https://security.metacpan.org/docs/guides/random-data-for...
related
https://www.rfc-editor.org/rfc/rfc9562.html#name-security...
related

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Robert Rothenberg
.