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CVE-2025-46728

Description

A flaw was found in cpp-httplib. This vulnerability allows for denial of service via oversized HTTP requests when using chunked transfer encoding or missing Content-Length headers, leading to uncontrolled memory allocation and potential server crash.

Statement

Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.

Mitigation

Short-term workaround through a Reverse Proxy: If updating the library immediately is not feasible, deploy a reverse proxy, such as Nginx or HAProxy, in front of the cpp-httplib application. Configure the proxy to enforce maximum request body size limits, thereby stopping excessively large requests before they reach the vulnerable library code.

Code fix. Enforce limits during parsing. If the limit is exceeded at any point during reading, the connection should be terminated immediately (e.g., by returning an error or closing the stream).

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