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Plack-1.0055
⭐ Starred 488 / Plack::Middleware::Refresh
Security Advisories (1)
CVE-2026-115825 (2026-10-25)

HTTP::Server::PSGI versions before 1.0056 for Perl allow a single request to crash the server by declaring a large Content-Length. The request body is read with sysread() calls sized by the remaining Content-Length. Perl grows the read buffer to the requested length before any data arrives, so the server tries to allocate as much memory as the client declares. A remote attacker can send one request with a large Content-Length and a few body bytes, and perl exits with an out-of-memory error before the application is called. HTTP::Server::PSGI runs as a single process, so the server stays down until restarted.

NAME

Plack::Middleware::Refresh - Refresh all modules in %INC

SYNOPSIS

enable "Refresh", cooldown => 3;
$app;

DESCRIPTION

This is yet another approach to refresh modules in %INC during the development cycle, without the need to have a forking process to watch for filesystem updates. This middleware, in a request time, compares the last refresh time and the current time and if the difference is bigger than cooldown seconds which defaults to 10, call Module::Refresh to reload all Perl modules in %INC if the files have been modified.

Note that this only reloads modules and not other files such as templates.

This middleware is quite similar to what Rack::Reoader does. If you have issues with this reloading technique, for instance when you have in-file templates that needs to be recompiled, or Moose classes that has make_immutable, take a look at plackup's default -r option or Plack::Loader::Shotgun instead.

AUTHOR

Tatsuhiko Miyagawa

SEE ALSO

Module::Refresh Rack::Reloader