Medium
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Request Body
Type: advisorySources: OSV
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-34441
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:59 UTC · Revision 1
Source evidence
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Request Body
core-osv · Original sourcePublished 31 Mar 2026, 21:21 UTC
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0.
osv:CVE-2026-34441
Complete source record
{
"id": "b18b6b8d7adc28828175441f923abd26859b89e7a9731160ae4dae5f7b14c98b",
"url": "https://osv.dev/vulnerability/CVE-2026-34441",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "cpp-httplib: HTTP Request Smuggling via Unconsumed GET Request Body",
"summary": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0.",
"evidence": "osv:CVE-2026-34441",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-34441",
"aliases": [
"CVE-2026-34441",
"GHSA-jv63-rm9j-6jwc"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/yhirose/cpp-httplib",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "b7e02de4a70024ed0389e0e7b971f674e4bc7d91"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "0.40.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "b7e02de4a70024ed0389e0e7b971f674e4bc7d91"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v0.40.0"
},
{
"cpe": "cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.40.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v0.39.0",
"v0.38.0",
"v0.37.2",
"v0.37.1",
"v0.37.0",
"v0.35.0",
"v0.34.0",
"latest",
"v0.33.1",
"v0.33.0",
"v0.32.0",
"v0.31.0",
"v0.30.2",
"v0.30.1",
"v0.30.0",
"v0.29.0",
"v0.28.0",
"v0.27.0",
"v0.26.0",
"v0.25.0",
"v0.24.0",
"v0.23.1",
"v0.23.0",
"v0.22.0",
"v0.21.0",
"v0.20.1",
"v0.20.0",
"v0.19.0",
"v0.18.7",
"v0.18.6",
"v0.18.5",
"v0.18.4",
"v0.18.3",
"v0.18.2",
"v0.18.1",
"v0.18.0",
"v0.17.3",
"v0.17.2",
"v0.17.1",
"v0.17.0",
"v0.16.3",
"v0.16.2",
"v0.16.1",
"v0.16.0",
"v0.15.3",
"v0.15.2",
"v0.15.1",
"v0.15.0",
"v0.14.3",
"v0.14.2",
"v0.14.1",
"v0.14.0",
"v0.13.3",
"v0.13.2",
"v0.13.1",
"v0.13.0",
"v0.12.6",
"v0.12.5",
"v0.12.4",
"v0.12.3",
"v0.12.2",
"v0.12.1",
"v0.12.0",
"v0.11.4",
"v0.11.3",
"v0.11.2",
"v0.11.1",
"v0.11.0",
"v0.10.9",
"v0.10.8",
"v0.10.7",
"v0.10.6",
"v0.10.5",
"v0.10.4",
"v0.10.3",
"v0.10.2",
"v0.10.1",
"v0.10.0",
"v0.9.10",
"v0.9.9",
"v0.9.8",
"v0.9.7",
"v0.9.6",
"v0.9.5",
"v0.9.4",
"v0.9.3",
"v0.9.2",
"v0.9.1",
"v0.9.0",
"v0.8.9",
"v0.8.8",
"v0.8.7",
"v0.8.6",
"v0.8.5",
"v0.8.4",
"v0.8.3",
"v0.8.2",
"v0.8.1",
"v0.8.0",
"v0.7.18",
"v0.7.17",
"v0.7.16",
"v0.7.15",
"v0.7.14",
"v0.7.13",
"v0.7.12",
"v0.7.11",
"v0.7.10",
"v0.7.9",
"v0.7.8",
"v0.7.7",
"v0.7.6",
"v0.7.5",
"v0.7.4",
"v0.7.3",
"v0.7.2",
"v0.7.1",
"v0.7.0",
"v0.6.7",
"v0.6.6",
"v0.6.5",
"v0.6.4",
"v0.6.3",
"v0.6.2",
"v0.6.1",
"v0.6.0",
"v0.5.13",
"v0.5.12",
"v0.5.11",
"v0.5.10",
"v0.5.9",
"v0.5.8",
"v0.5.7",
"v0.5.6",
"v0.5.5",
"v0.5.4",
"v0.5.3",
"v0.5.2",
"v0.5.1",
"v0.5.0",
"v0.4.2",
"v0.4.1",
"v0.4.0",
"v0.3.3",
"v0.3.2",
"v0.3.1",
"v0.3.0",
"v0.2.6",
"v0.2.5",
"v0.2.4",
"v0.2.3",
"v0.2.2",
"v0.2.1",
"v0.2.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34441.json"
}
}
],
"modified": "2026-10-28T02:30:30.897559220Z",
"provider": "osv",
"references": [
"https://github.com/yhirose/cpp-httplib/releases/tag/v0.40.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34441.json",
"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-jv63-rm9j-6jwc",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34441"
],
"provider_metadata": {
"cwe_ids": [
"CWE-444"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34441.json"
}
},
"related_cves": [
{
"value": "CVE-2026-34441",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 498105,
"published_at": "2026-03-31T21:21:33.197+00:00"
}