Authentication Bypass Affecting libcpp-httplib0_22 package, versions <0.22.0-160000.3.1


Severity

Recommended
0.0
critical
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.34% (26th percentile)

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  • Snyk IDSNYK-SLES1600-LIBCPPHTTPLIB022-15053989
  • published22 Jan 2026
  • disclosed15 Jan 2026

Introduced: 15 Jan 2026

CVE-2025-66570  (opens in a new tab)
CWE-290  (opens in a new tab)
CWE-345  (opens in a new tab)
CWE-807  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 libcpp-httplib0_22 to version 0.22.0-160000.3.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcpp-httplib0_22 package and not the libcpp-httplib0_22 package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1