/ 
Plack-0.9945
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/ Plack::Middleware::Lint
Security Advisories (4)
CPANSA-Plack-2015-0202 (2015-02-02)

Fixed a possible directory traversal with Plack::App::File on Win32.

CPANSA-Plack-2014-0801 (2014-08-01)

Plack::App::File would previously strip trailing slashes off provided paths. This in combination with the common pattern of serving files with Plack::Middleware::Static could allow an attacker to bypass a whitelist of generated files

CPANSA-Plack-2013-0131 (2013-01-31)

Fixed directory traversal bug in Plack::App::File on win32 environments

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::Lint - Validate request and response

SYNOPSIS

use Plack::Middleware::Lint;

my $app = sub { ... }; # your app or middleware
$app = Plack::Middleware::Lint->wrap($app);

# Or from plackup
plackup -e 'enable "Lint"' myapp.psgi

DESCRIPTION

Plack::Middleware::Lint is a middleware component to validate request and response environment formats. You are strongly suggested to use this middleware when you develop a new framework adapter or a new PSGI web server that implements the PSGI interface.

This middleware is enabled by default when you run plackup or other launcher tools with the default environment development value.

AUTHOR

Tatsuhiko Miyagawa

Tokuhiro Matsuno

SEE ALSO

Plack