CVE-2015-10149
Dancer versions before 1.3400 for Perl pass unvalidated session ids from the session cookie to the session engine
Description
Dancer versions before 1.3400 for Perl pass unvalidated session ids from the session cookie to the session engine. read_session_id returns the cookie value as the session id without checking its characters, and Dancer hands it to the session engine to load the session. A remote attacker may cause path traversal or injection in a session engine that uses the id in a file path, cache command or query without checking it.
Key facts
- Published
- 14 Nov 2026
- Last changed
- 14 Nov 2026
- Assigned by
- CPANSec
- EPSS
- 0.368% likely to be exploited in the next 30 days, higher than 31.124% of CVEs (scores for 15 Nov 2026)
What to do
- Upgrade to Dancer 1.3400 or later.CNA solution statement
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Timeline
- 3 Jun 2015 Session id validation vulnerability first reported in issue 1117.
- 15 Feb 2016 Dancer version 1.3300 adds session id validation.
- 16 Feb 2016 Dancer version 1.3301 reverts session id changes that broke Dancer::Session::Cookie.
- 4 Feb 2018 Pull request 1172 with session id validation created,
- 20 May 2018 Dancer version 1.3203 released with session id validation.
- 15 Jun 2018 Dancer version 1.3400 released that promotes previous trial releases to stable release.
- 14 Nov 2026 Published