CVE-2026-54919
highpriority · track · 0EPSS 0.003 · 18 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.4
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
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references (9)
External citations — patches, advisories, analysis.
- https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6cnnvd
- https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0cnnvd
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2cnnvd
- https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6enisa_euvd
- https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0enisa_euvd
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2enisa_euvd
- https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6Patchnvd
- https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0ProductRelease Notesnvd
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