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
- 0.11.4+ds-1, 0.11.4+ds-1+deb12u1, 0.11.4+ds-2, 0.11.4+ds-3, 0.13.1+ds-1, 0.14.0+ds-1, 0.14.1+ds-1, 0.14.1+ds-2, 0.14.2+ds-1, 0.14.3+ds-1, 0.14.3+ds-1.1, 0.14.3+ds-1.1~exp1, 0.15.3+ds-1, 0.15.3+ds-2, 0.15.3+ds-3, 0.16.0+ds-1, 0.16.3+ds-1, 0.16.3+ds-2, 0.18.0+ds-1, 0.18.7-1, 0.18.7-1+deb13u1, 0.20.1+ds-3, 0.25.0+ds-1, 0.26.0+ds-2, 0.41.0+ds-1, 0.41.0+ds-2, 0.41.0+ds-3, 0.41.0+ds-3~bpo13+1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-54919
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:22 UTC · Revision 2
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:DEBIAN-CVE-2026-54919
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
Complete source record
{
"id": "e44d55c6e757b327b98699cc0a419758f7c20022e2f75c5ce9d4bead138c53e0",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-54919",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-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.",
"evidence": "osv:DEBIAN-CVE-2026-54919",
"products": [
{
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},
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
"value": "0.14.3+ds-1.1",
"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
"value": "0.18.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.20.1+ds-3",
"evidence": "/affected/0/versions"
},
{
"value": "0.25.0+ds-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.26.0+ds-2",
"evidence": "/affected/0/versions"
},
{
"value": "0.41.0+ds-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.41.0+ds-2",
"evidence": "/affected/0/versions"
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{
"value": "0.41.0+ds-3",
"evidence": "/affected/0/versions"
},
{
"value": "0.41.0+ds-3~bpo13+1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.18.7-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.18.7-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "0.20.1+ds-3",
"evidence": "/affected/1/versions"
},
{
"value": "0.25.0+ds-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.26.0+ds-2",
"evidence": "/affected/1/versions"
},
{
"value": "0.41.0+ds-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.41.0+ds-2",
"evidence": "/affected/1/versions"
},
{
"value": "0.41.0+ds-3",
"evidence": "/affected/1/versions"
},
{
"value": "0.41.0+ds-3~bpo13+1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "cpp-httplib",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "0.18.7-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.20.1+ds-3",
"evidence": "/affected/2/versions"
},
{
"value": "0.25.0+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.26.0+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "0.41.0+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.41.0+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "0.41.0+ds-3",
"evidence": "/affected/2/versions"
},
{
"value": "0.41.0+ds-3~bpo13+1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-54919",
"aliases": [
"DEBIAN-CVE-2026-54919"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cpp-httplib",
"purl": "pkg:deb/debian/cpp-httplib?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.11.4+ds-1",
"0.11.4+ds-1+deb12u1",
"0.11.4+ds-2",
"0.11.4+ds-3",
"0.13.1+ds-1",
"0.14.0+ds-1",
"0.14.1+ds-1",
"0.14.1+ds-2",
"0.14.2+ds-1",
"0.14.3+ds-1",
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"0.14.3+ds-1.1~exp1",
"0.15.3+ds-1",
"0.15.3+ds-2",
"0.15.3+ds-3",
"0.16.0+ds-1",
"0.16.3+ds-1",
"0.16.3+ds-2",
"0.18.0+ds-1",
"0.18.7-1",
"0.20.1+ds-3",
"0.25.0+ds-1",
"0.26.0+ds-2",
"0.41.0+ds-1",
"0.41.0+ds-2",
"0.41.0+ds-3",
"0.41.0+ds-3~bpo13+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54919.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
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"package": {
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"purl": "pkg:deb/debian/cpp-httplib?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
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"0.18.7-1+deb13u1",
"0.20.1+ds-3",
"0.25.0+ds-1",
"0.26.0+ds-2",
"0.41.0+ds-1",
"0.41.0+ds-2",
"0.41.0+ds-3",
"0.41.0+ds-3~bpo13+1"
],
"database_specific": {
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},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
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],
"package": {
"name": "cpp-httplib",
"purl": "pkg:deb/debian/cpp-httplib?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.18.7-1",
"0.20.1+ds-3",
"0.25.0+ds-1",
"0.26.0+ds-2",
"0.41.0+ds-1",
"0.41.0+ds-2",
"0.41.0+ds-3",
"0.41.0+ds-3~bpo13+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54919.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
],
"modified": "2026-10-26T11:47:35.084034844Z",
"provider": "osv",
"upstream": [
"CVE-2026-54919"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-54919"
]
},
"related_cves": [
{
"value": "CVE-2026-54919",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450915,
"published_at": "2026-07-10T17:16:58.7+00:00"
}