/ 
Plack-1.0053
⭐ Starred 488 / Plack::Middleware::SimpleContentFilter
Security Advisories (1)
CVE-2026-7381 (2026-04-29)

Plack::Middleware::XSendfile versions through 1.0053 for Perl can allow client-controlled path rewriting. Plack::Middleware::XSendfile allows the variation setting (sendfile type) to be set by the client via the X-Sendfile-Type header, if it is not considered in the middleware constructor or the Plack environment. A malicious client can set the X-Sendfile-Type header to "X-Accel-Redirect" to services running behind nginx reverse proxies, and then set the X-Accel-Mapping to map the path to an arbitrary file on the server. Since 1.0053, Plack::Middleware::XSendfile is deprecated and will be removed from future releases of Plack. This is similar to CVE-2025-61780 for Rack::Sendfile, although Plack::Middleware::XSendfile has some mitigations that disallow regular expressions to be used in the mapping, and only apply the mapping for the "X-Accel-Redirect" type.

NAME

Plack::Middleware::SimpleContentFilter - Filters response content

SYNOPSIS

use Plack::Builder;

my $app = sub {
    return [ 200, [ 'Content-Type' => 'text/plain' ], [ 'Hello Foo' ] ];
};

builder {
    enable "Plack::Middleware::SimpleContentFilter",
        filter => sub { s/Foo/Bar/g; };
    $app;
};

DESCRIPTION

This middleware should be considered as a demo. Running this against your application might break your HTML unless you code the filter callback carefully.

Plack::Middleware::SimpleContentFilter is a simple content text filter to run against response body. This middleware is only enabled against responses with text/* Content-Type.

AUTHOR

Tatsuhiko Miyagawa