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Plack-1.0053
⭐ Starred 488 / Plack::Middleware::ConditionalGET
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::ConditionalGET - Middleware to enable conditional GET

SYNOPSIS

builder {
    enable "ConditionalGET";
    ....
};

DESCRIPTION

This middleware enables conditional GET and HEAD using If-None-Match and If-Modified-Since header. The application should set either or both of Last-Modified or ETag response headers per RFC 2616. When either of the conditions is met, the response body is set to be zero length and the status is set to 304 Not Modified.

SEE ALSO

Rack::ConditionalGet