Plack::Middleware::Session::Cookie versions through 0.21 for Perl allows remote code execution.
Plack::Middleware::Session::Cookie versions through 0.21 has a security vulnerability where it allows an attacker to execute arbitrary code on the server during deserialization of the cookie data, when there is no secret used to sign the cookie.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://gist.github.com/miyagawa/2b8764af908a0dacd43d
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.23-TRIAL/chang…
9b29abf9-4ab0-4765-b253-1875cd9b441e
http://www.openwall.com/lists/oss-security/2026/03/26/2
af854a3a-2127-422b-91ae-364da2661108