Bug 2560479 (CVE-2026-115825)

Summary: CVE-2026-115825 perl-Plack: perl-Plack: Denial of Service via large Content-Length header
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in perl-Plack. The HTTP::Server::PSGI server pre-allocates memory for incoming request bodies based entirely on the declared Content-Length header before reading data. A remote attacker can exploit this flaw by sending an HTTP request with an excessively large Content-Length header, causing the server to exhaust memory and crash. This results in a Denial of Service (DoS), keeping the single-process server unavailable until it is restarted.
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Bug Depends On: 2562412, 2562408, 2562414, 2562415, 2562416, 2562418    
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Description OSIDB Bzimport 2026-10-25 17:01:31 UTC 
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.