High
Potential denial-of-service vulnerability via repeated headers when using ASGI
Type: advisorySources: OSV
An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. `ASGIRequest` allows a remote attacker to cause a potential denial-of-service via a crafted request with multiple duplicate headers. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Jiyong Yang for reporting this issue.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-14550
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 11:32 UTC · Revision 1
Source evidence
Potential denial-of-service vulnerability via repeated headers when using ASGI
core-osv · Original sourcePublished 3 Feb 2026, 14:38 UTC
An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. `ASGIRequest` allows a remote attacker to cause a potential denial-of-service via a crafted request with multiple duplicate headers. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Jiyong Yang for reporting this issue.
osv:CVE-2025-14550
Complete source record
{
"id": "5c3037bbf7ada04e21f219257d84a52f434a030b46fe931b09d46bee72800eec",
"url": "https://osv.dev/vulnerability/CVE-2025-14550",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Potential denial-of-service vulnerability via repeated headers when using ASGI",
"summary": "An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. `ASGIRequest` allows a remote attacker to cause a potential denial-of-service via a crafted request with multiple duplicate headers. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Jiyong Yang for reporting this issue.",
"evidence": "osv:CVE-2025-14550",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2025-14550",
"aliases": [
"BIT-django-2025-14550",
"CVE-2025-14550",
"GHSA-33mw-q7rj-mjwj",
"PYSEC-2026-43"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/django/asgiref",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "d97a7339524c89798c510de6c142b663fe40400c"
}
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"database_specific": {
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{
"range": [
{
"introduced": "3"
},
{
"fixed": "3.11.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
},
{
"repo": "https://github.com/django/django",
"type": "GIT",
"events": [
{
"introduced": "97aa3b7f08f51669e118f3af5ca91026e39664c3"
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{
"fixed": "20c71f6b91324cf401056c72136c14e0ec2bf7bf"
},
{
"introduced": "9e7cc2b628fe8fd3895986af9b7fc9525034c1b0"
},
{
"fixed": "4a96a199bbb1d3dca45ea16bf643216e179cb8bc"
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{
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{
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"cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
"range": [
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{
"fixed": "4.2.28"
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{
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"range": [
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{
"fixed": "5.2.11"
}
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"source": "CPE_RANGE"
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{
"cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
"range": [
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{
"fixed": "6.0.2"
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"source": "CPE_RANGE"
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}
}
],
"versions": [
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"3.2.6",
"3.2.5",
"3.2.4",
"3.2.3",
"3.2.2",
"3.2.1",
"3.2.0",
"3.1.4",
"3.1.3",
"3.1.2",
"3.1.1",
"3.1.0",
"3.0.0",
"2.3.2",
"2.3.1",
"2.3.0",
"2.2.0",
"2.1.6",
"2.1.5",
"2.1.4",
"2.1.3",
"2.1.2",
"2.1.1",
"2.1.0",
"2.0.1",
"2.0.0",
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"0.9",
"0.8",
"6.0.1",
"5.2.10",
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"5.2.9",
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"5.2.7",
"5.2.6",
"5.2.5",
"5.2.4",
"5.2.3",
"5.2.2",
"5.2.1",
"5.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-14550.json"
}
}
],
"modified": "2026-10-28T02:30:28.235361540Z",
"provider": "osv",
"references": [
"https://github.com/django/asgiref/",
"https://github.com/django/django/",
"https://docs.djangoproject.com/en/dev/releases/security/",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/14xxx/CVE-2025-14550.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-14550",
"https://www.djangoproject.com/weblog/2026/feb/03/security-releases/",
"https://pypi.org/project/Django/",
"https://pypi.org/project/asgiref/",
"https://groups.google.com/g/django-announce"
],
"provider_metadata": {
"cwe_ids": [
"CWE-407"
],
"cna_assigner": "DSF",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/14xxx/CVE-2025-14550.json"
}
},
"related_cves": [
{
"value": "CVE-2025-14550",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 494983,
"published_at": "2026-02-03T14:38:15.875+00:00"
}