Security update for cpp-httplib SUSE Patch security@suse.de SUSE Security Team openSUSE-SU-2026:20056-1 Final 1 1 2026-01-15T22:11:25Z current 2026-01-15T22:11:25Z 2026-01-15T22:11:25Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for cpp-httplib This update for cpp-httplib fixes the following issues: - CVE-2025-66570: IP spoofing, log poisoning, and authorization bypass via header shadowing due to acceptance and parsing of client-controlled injected HTTP headers in incoming requests (bsc#1254734). - CVE-2025-66577: access and error log poisoning with spoofed client IPs due to unconditional acceptance of client-controlled `X-Forwarded-For` and `X-Real-IP` headers (bsc#1254735). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). openSUSE-Leap-16.0-150 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1254734 SUSE Bug 1254734 https://bugzilla.suse.com/1254735 SUSE Bug 1254735 https://www.suse.com/security/cve/CVE-2025-66570/ SUSE CVE CVE-2025-66570 page https://www.suse.com/security/cve/CVE-2025-66577/ SUSE CVE CVE-2025-66577 page openSUSE Leap 16.0 cpp-httplib-devel-0.22.0-160000.3.1 libcpp-httplib0_22-0.22.0-160000.3.1 cpp-httplib-devel-0.22.0-160000.3.1 as a component of openSUSE Leap 16.0 libcpp-httplib0_22-0.22.0-160000.3.1 as a component of openSUSE Leap 16.0 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allows attacker-controlled HTTP headers to influence server-visible metadata, logging, and authorization decisions. An attacker can inject headers named REMOTE_ADDR, REMOTE_PORT, LOCAL_ADDR, LOCAL_PORT that are parsed into the request header multimap via read_headers() in httplib.h (headers.emplace), then the server later appends its own internal metadata using the same header names in Server::process_request without erasing duplicates. Because Request::get_header_value returns the first entry for a header key (id == 0) and the client-supplied headers are parsed before server-inserted headers, downstream code that uses these header names may inadvertently use attacker-controlled values. Affected files/locations: cpp-httplib/httplib.h (read_headers, Server::process_request, Request::get_header_value, get_header_value_u64) and cpp-httplib/docker/main.cc (get_client_ip, nginx_access_logger, nginx_error_logger). Attack surface: attacker-controlled HTTP headers in incoming requests flow into the Request.headers multimap and into logging code that reads forwarded headers, enabling IP spoofing, log poisoning, and authorization bypass via header shadowing. This vulnerability is fixed in 0.27.0. CVE-2025-66570 openSUSE Leap 16.0:cpp-httplib-devel-0.22.0-160000.3.1 openSUSE Leap 16.0:libcpp-httplib0_22-0.22.0-160000.3.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2025-66570.html CVE-2025-66570 https://bugzilla.suse.com/1254734 SUSE Bug 1254734 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allows attacker-controlled HTTP headers to influence server-visible metadata, logging, and authorization decisions. An attacker can supply X-Forwarded-For or X-Real-IP headers which get accepted unconditionally by get_client_ip() in docker/main.cc, causing access and error logs (nginx_access_logger / nginx_error_logger) to record spoofed client IPs (log poisoning / audit evasion). This vulnerability is fixed in 0.27.0. CVE-2025-66577 openSUSE Leap 16.0:cpp-httplib-devel-0.22.0-160000.3.1 openSUSE Leap 16.0:libcpp-httplib0_22-0.22.0-160000.3.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2025-66577.html CVE-2025-66577 https://bugzilla.suse.com/1254735 SUSE Bug 1254735