Bug 2463971 (CVE-2026-7381)

Summary: CVE-2026-7381 Plack::Middleware::XSendfile: Plack: Plack::Middleware::XSendfile: Information disclosure via client-controlled path rewriting
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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A flaw was found in Plack::Middleware::XSendfile. A remote attacker can exploit this vulnerability by manipulating HTTP headers, specifically X-Sendfile-Type and X-Accel-Mapping, when the application is deployed behind an nginx reverse proxy. This client-controlled path rewriting could allow the attacker to access arbitrary files on the server, leading to information disclosure.
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Bug Depends On: 2464097, 2464098    
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Description OSIDB Bzimport 2026-04-29 23:01:20 UTC 
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.