rails — security advisory
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
- Products
- rails
- Affected versions
- 2:7.2.2.1+dfsg-7, 2:7.2.2.2+dfsg-1, 2:7.2.2.2+dfsg-2, 2:7.2.2.2+dfsg-2~deb13u1, 2:7.2.2.2+dfsg-2~deb13u2, 2:7.2.3+dfsg-1, 2:7.2.3+dfsg-2, 2:7.2.3+dfsg-3
- Fixed versions
- 2:7.2.2.2+dfsg-2~deb13u2, 2:7.2.3.1+dfsg-1
- CVEs
- CVE-2026-33174
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 09:10 UTC · Revision 1
Source evidence
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
osv:DEBIAN-CVE-2026-33174
rails
Fixed versions: 2:7.2.2.2+dfsg-2~deb13u2
rails
Fixed versions: 2:7.2.3.1+dfsg-1
Complete source record
{
"id": "83450e39aaf50228aa54e86cc4927f8af7b11ebb39dde3b1e69d25f529ecc085",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-33174",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-33174",
"summary": "Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.",
"evidence": "osv:DEBIAN-CVE-2026-33174",
"products": [
{
"name": {
"value": "rails",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:7.2.2.2+dfsg-2~deb13u2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2:7.2.2.1+dfsg-7",
"evidence": "/affected/0/versions"
},
{
"value": "2:7.2.2.2+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "2:7.2.2.2+dfsg-2~deb13u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "rails",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:7.2.3.1+dfsg-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "2:7.2.2.1+dfsg-7",
"evidence": "/affected/1/versions"
},
{
"value": "2:7.2.2.2+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "2:7.2.2.2+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "2:7.2.2.2+dfsg-2~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "2:7.2.2.2+dfsg-2~deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "2:7.2.3+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "2:7.2.3+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "2:7.2.3+dfsg-3",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-33174",
"aliases": [
"DEBIAN-CVE-2026-33174"
],
"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": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:7.2.2.2+dfsg-2~deb13u2"
}
]
}
],
"package": {
"name": "rails",
"purl": "pkg:deb/debian/rails?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2:7.2.2.1+dfsg-7",
"2:7.2.2.2+dfsg-1",
"2:7.2.2.2+dfsg-2~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33174.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:7.2.3.1+dfsg-1"
}
]
}
],
"package": {
"name": "rails",
"purl": "pkg:deb/debian/rails?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2:7.2.2.1+dfsg-7",
"2:7.2.2.2+dfsg-1",
"2:7.2.2.2+dfsg-2",
"2:7.2.2.2+dfsg-2~deb13u1",
"2:7.2.2.2+dfsg-2~deb13u2",
"2:7.2.3+dfsg-1",
"2:7.2.3+dfsg-2",
"2:7.2.3+dfsg-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33174.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-08T15:00:07.645622147Z",
"provider": "osv",
"upstream": [
"CVE-2026-33174"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-33174"
]
},
"related_cves": [
{
"value": "CVE-2026-33174",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 99703,
"published_at": "2026-03-24T00:16:28.63+00:00"
}