Vulnerability Details CVE-2026-54919
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend versions from 0.31.0 through 0.46.1 and wolfSSL backend versions from 0.33.0 through 0.46.1, when cpp-httplib is built with CPPHTTPLIB_MBEDTLS_SUPPORT or CPPHTTPLIB_WOLFSSL_SUPPORT and a client connects to an IP-literal host with server certificate verification enabled, SSLClient and Client in HTTPS mode skip certificate chain validation and WebSocketClient on the Mbed TLS backend skips verification altogether, allowing a man-in-the-middle attacker positioned to intercept traffic to present a crafted certificate and read or modify the traffic. This issue is fixed in version 0.47.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 17.9%
CVSS Severity
CVSS v3 Score 7.4
References
Products affected by CVE-2026-54919
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cpe:2.3:a:yhirose:cpp-httplib:0.31.0
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cpe:2.3:a:yhirose:cpp-httplib:0.32.0
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cpe:2.3:a:yhirose:cpp-httplib:0.33.0
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cpe:2.3:a:yhirose:cpp-httplib:0.33.1
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cpe:2.3:a:yhirose:cpp-httplib:0.34.0
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cpe:2.3:a:yhirose:cpp-httplib:0.35.0
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cpe:2.3:a:yhirose:cpp-httplib:0.36.0
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cpe:2.3:a:yhirose:cpp-httplib:0.37.0
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cpe:2.3:a:yhirose:cpp-httplib:0.37.1
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cpe:2.3:a:yhirose:cpp-httplib:0.37.2
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cpe:2.3:a:yhirose:cpp-httplib:0.38.0
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cpe:2.3:a:yhirose:cpp-httplib:0.39.0
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cpe:2.3:a:yhirose:cpp-httplib:0.40.0
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cpe:2.3:a:yhirose:cpp-httplib:0.41.0
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cpe:2.3:a:yhirose:cpp-httplib:0.42.0
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cpe:2.3:a:yhirose:cpp-httplib:0.43.0
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cpe:2.3:a:yhirose:cpp-httplib:0.43.1
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cpe:2.3:a:yhirose:cpp-httplib:0.43.3
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cpe:2.3:a:yhirose:cpp-httplib:0.43.4
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cpe:2.3:a:yhirose:cpp-httplib:0.44.0
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cpe:2.3:a:yhirose:cpp-httplib:0.45.0
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cpe:2.3:a:yhirose:cpp-httplib:0.45.1
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cpe:2.3:a:yhirose:cpp-httplib:0.46.0
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cpe:2.3:a:yhirose:cpp-httplib:0.46.1