Resource Exhaustion Affecting cpp-httplib package, versions <0.25.0+ds-3
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-CPPHTTPLIB-10062615
- published8 May 2025
- disclosed6 May 2025
Introduced: 6 May 2025
CVE-2025-46728 (opens in a new tab)How to fix?
Upgrade Debian:unstable cpp-httplib to version 0.25.0+ds-3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream cpp-httplib package and not the cpp-httplib package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
cpp-httplib is a C++ header-only HTTP/HTTPS server and client library. Prior to version 0.20.1, the library fails to enforce configured size limits on incoming request bodies when Transfer-Encoding: chunked is used or when no Content-Length header is provided. A remote attacker can send a chunked request without the terminating zero-length chunk, causing uncontrolled memory allocation on the server. This leads to potential exhaustion of system memory and results in a server crash or unresponsiveness. Version 0.20.1 fixes the issue by enforcing limits during parsing. If the limit is exceeded at any point during reading, the connection is terminated immediately. A short-term workaround through a Reverse Proxy is available. If updating the library immediately is not feasible, deploy a reverse proxy (e.g., Nginx, 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.