High
Security advisory
In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-49017
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 03:03 UTC · Revision 1
Source evidence
In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.
osv:CVE-2026-49017
Complete source record
{
"id": "21fc01074858bcbf5ec0c2cb84f82ff3ffba275a7c9b78f53588ec343bb99c36",
"url": "https://osv.dev/vulnerability/CVE-2026-49017",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-49017",
"summary": "In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.",
"evidence": "osv:CVE-2026-49017",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-49017",
"aliases": [
"CVE-2026-49017",
"GHSA-g7jq-j257-rww2",
"PYSEC-2026-3080"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openstack/swift",
"type": "GIT",
"events": [
{
"introduced": "9ae4dd3321a6f3e410c8221efd27814a1dfd2ece"
},
{
"fixed": "980b5b6987fa8d4ea5cdfa8256b00430d8bfc2d1"
},
{
"introduced": "82cb5a5d78b91c6af258cd8f06d30f69be90fa18"
},
{
"fixed": "bbd9c5e012d9f4821d67b9dfd538180de63e733b"
},
{
"introduced": "555026d200337b39c97eb9dafd26901ff40c7a1d"
},
{
"fixed": "f701907958c791f10ebb775690b9d21d39d92ae8"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.35.1"
},
{
"fixed": "2.35.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.36.0"
},
{
"fixed": "2.36.2"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.37.0"
},
{
"fixed": "2.37.2"
}
],
"source": "CPE_RANGE"
}
]
}
},
{
"repo": "https://opendev.org/openstack/swift",
"type": "GIT",
"events": [
{
"introduced": "82cb5a5d78b91c6af258cd8f06d30f69be90fa18"
},
{
"fixed": "bbd9c5e012d9f4821d67b9dfd538180de63e733b"
},
{
"introduced": "555026d200337b39c97eb9dafd26901ff40c7a1d"
},
{
"fixed": "f701907958c791f10ebb775690b9d21d39d92ae8"
},
{
"introduced": "9ae4dd3321a6f3e410c8221efd27814a1dfd2ece"
},
{
"fixed": "980b5b6987fa8d4ea5cdfa8256b00430d8bfc2d1"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "2.36.0"
},
{
"fixed": "2.36.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "2.37.0"
},
{
"fixed": "2.37.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "2.35.1"
},
{
"fixed": "2.35.3"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
}
],
"versions": [
"2.35.2",
"2.36.1",
"2.37.1",
"2.37.0",
"2.36.0",
"2.35.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49017.json"
}
}
],
"modified": "2026-10-28T02:30:25.344040667Z",
"provider": "osv",
"references": [
"https://opendev.org/openstack/swift",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49017.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-49017",
"https://bugs.launchpad.net/bugs/2152205",
"https://review.opendev.org/c/openstack/swift/+/987957",
"https://review.opendev.org/c/openstack/swift/+/988093"
],
"provider_metadata": {
"cwe_ids": [
"CWE-835"
],
"cna_assigner": "mitre",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49017.json"
}
},
"related_cves": [
{
"value": "CVE-2026-49017",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492104,
"published_at": "2026-05-27T01:57:58.831+00:00"
}