Medium
Security advisory
Uvicorn before 0.11.7 is vulnerable to HTTP response splitting. CRLF sequences are not escaped in the value of HTTP headers. Attackers can exploit this to add arbitrary headers to HTTP responses, or even return an arbitrary response body, whenever crafted input is used to construct HTTP headers.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-7695
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:32 UTC · Revision 1
Source evidence
Uvicorn before 0.11.7 is vulnerable to HTTP response splitting. CRLF sequences are not escaped in the value of HTTP headers. Attackers can exploit this to add arbitrary headers to HTTP responses, or even return an arbitrary response body, whenever crafted input is used to construct HTTP headers.
osv:CVE-2020-7695
Complete source record
{
"id": "1a13ded7a87ddf90103ab2f650b381616d4ac4b24214a6f76ca27486cd56a42f",
"url": "https://osv.dev/vulnerability/CVE-2020-7695",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-7695",
"summary": "Uvicorn before 0.11.7 is vulnerable to HTTP response splitting. CRLF sequences are not escaped in the value of HTTP headers. Attackers can exploit this to add arbitrary headers to HTTP responses, or even return an arbitrary response body, whenever crafted input is used to construct HTTP headers.",
"evidence": "osv:CVE-2020-7695",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-7695",
"aliases": [
"CVE-2020-7695",
"GHSA-f97h-2pfx-f59f",
"PYSEC-2020-151",
"SNYK-PYTHON-UVICORN-570471"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/Kludex/uvicorn",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "178bee6ef51c79b296ca70a467f00da20dfae712"
}
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"database_specific": {
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{
"cpe": "cpe:2.3:a:encode:uvicorn:*:*:*:*:*:*:*:*",
"range": [
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{
"fixed": "0.11.7"
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"source": "CPE_RANGE"
}
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7695.json"
}
}
],
"modified": "2026-10-20T10:54:28.861539512Z",
"provider": "osv",
"references": [
"https://github.com/encode/uvicorn",
"https://snyk.io/vuln/SNYK-PYTHON-UVICORN-570471"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-7695",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 385436,
"published_at": "2020-07-27T12:15:11.993+00:00"
}