High
cpp-httplib — security advisory
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.
- Products
- cpp-httplib
- Affected versions
- 0.10.1+ds-1, 0.10.2+ds-1, 0.10.3+ds-1, 0.10.3+ds-1ubuntu0.1~esm1, 0.10.3+ds-1ubuntu0.1~esm2, 0.13.1+ds-1ubuntu1, 0.14.3+ds-1, 0.14.3+ds-1.1, 0.14.3+ds-1.1build1, 0.14.3+ds-1.1build2, 0.14.3+ds-1.1ubuntu0.1~esm1, 0.14.3+ds-1.1ubuntu0.1~esm2, 0.18.7-1, 0.26.0+ds-2ubuntu2, 0.26.0+ds-2ubuntu3, 0.26.0+ds-2ubuntu3+esm1, 0.26.0+ds-2ubuntu4, 0.9.10+ds-1, 0.9.9+ds-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-54919
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:46 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-54919
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
Complete source record
{
"id": "7e3d1cf839e8bd4a43c92d1c617760898daeec34b85d8c14ec7c2d0c3ce32d65",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-54919",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-54919",
"summary": "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.",
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"aliases": [
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"metrics": [
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"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
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{
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"affected": [
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"modified": "2026-10-17T12:59:07.173887687Z",
"provider": "osv",
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"references": [
"https://ubuntu.com/security/CVE-2026-54919",
"https://www.cve.org/CVERecord?id=CVE-2026-54919",
"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2",
"https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6",
"https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0"
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"security_relevant": true,
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"source_id": "core-osv",
"document_id": 359318,
"published_at": "2026-07-10T17:16:00+00:00"
}