CVE-2025-53628

cpp-httplib before 0.20.1 is vulnerable to HTTP header smuggling due to insecure trailers merge (CVE-2025-53628). Public advisories note the fix is in 0.20.1. OpenSUSE/SUSE advisories across platforms reference this CVE and provide a version-0.20.1 upgrade as remediation. No exploit details are p...

CVE-2026-21428

CVE-2026-21428 affects cpp-httplib (C++11 single-file header-only library). The vulnerability is in write_headers: it does not validate CR/LF in user-supplied header values, enabling injection of extra headers, potential tampering with the request body, and SSRF when paired with servers supportin...

CVE-2026-32627

cpp-httplib before 0.37.2 is vulnerable when using a proxy and set_follow_location(true): HTTPS redirects can bypass TLS certificate and hostname verification on the redirected connection, allowing a network attacker to intercept credentials or tokens. The issue is fixed in 0.37.2.

CVE-2026-22776

CVE-2026-22776 affects cpp-httplib prior to 0.30.1. The DoS arises from unsafe handling of compressed HTTP request bodies (Content-Encoding: gzip, br, etc.); the implementation validates payload_max_length against the compressed data size but does not cap the decompressed data in memory. This can...

CVE-2026-46527

cpp-httplib (C++11 header-only library) before 0.44.0 is vulnerable when Server::set_trusted_proxies() is used with a non-empty trusted-proxy list. An attacker can send an HTTP request with an X-Forwarded-For header that parses to no valid IP segments. The code path then calls get_client_ip(), wh...