CVE-2026-28435 Payload size limit bypass via gzip decompression in ContentReader (streaming) allows oversized request bodies in cpp-httplib

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, cpp-httplib httplib.h does not enforce Server::setpayloadmaxlength on the decompressed request body when using HandlerWithContentReader streaming ContentReader with Content-Encoding: gzip or other...

The vulnerability of the write_headers() function in the cpp-httplib library, which allows a hacker to modify protected information

The vulnerability of the writeheaders function in the cpp-httplib library is related to the lack of measures taken to neutralize CRLF sequences. Exploiting this vulnerability could allow an attacker, operating remotely, to modify protected information by sending a specially crafted HTTP request...

CVE-2026-21428

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the writeheaders function does not check for CR & LF characters in user supplied headers, allowing untrusted header value to escape header lines. This vulnerability allows attackers to add...

SUSE CVE-2025-0825

cpp-httplib version v0.17.3 through v0.18.3 fails to filter CRLF characters "\r\n" when those are prefixed with a null byte. This enables attackers to exploit CRLF injection that could further lead to HTTP Response Splitting, XSS, and more...