Low
Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests
Type: advisorySources: OSV
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 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33658
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:46 UTC · Revision 1
Source evidence
Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests
core-osv · Original sourcePublished 26 Mar 2026, 21:03 UTC
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 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
osv:CVE-2026-33658
Complete source record
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"url": "https://osv.dev/vulnerability/CVE-2026-33658",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests",
"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 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.",
"evidence": "osv:CVE-2026-33658",
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"affected": [
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"repo": "https://github.com/rails/rails",
"type": "GIT",
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"source": "CPE_RANGE"
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"database_specific": {
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"modified": "2026-10-28T02:30:31.038527121Z",
"provider": "osv",
"references": [
"https://github.com/rails/rails/releases/tag/v7.2.3.1",
"https://github.com/rails/rails/releases/tag/v8.0.4.1",
"https://github.com/rails/rails/releases/tag/v8.1.2.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33658.json",
"https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg",
"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33658"
],
"provider_metadata": {
"cwe_ids": [
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33658.json"
}
},
"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 497986,
"published_at": "2026-03-26T21:03:25.319+00:00"
}