Fix the following vulnerability:
- CVE-2025-46728
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.
For more information, see:
- https://www.cve.org/CVERecord?id=CVE-2025-46728
- https://github.com/yhirose/cpp-httplib/commit/7b752106ac42bd5b907793950d9125a0972c8e8e
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
(cherry picked from commit aea7c89396)
Signed-off-by: Julien Olivain <ju.o@free.fr>
Thomas Perale
fd313c4ceb