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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00016.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
rails activestorage affected
Version Status Constraints
>= 8.1.0.beta1, < 8.1.2.1 affected —
>= 8.0.0.beta1, < 8.0.4.1 affected —
< 7.2.3.1 affected —

Configuration 1 [-]

OR cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*

No data.

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Rubyonrails Subscribe
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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-r46p-8f7g-vvvg Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5 cve-icon cve-icon cve-icon
https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a cve-icon cve-icon cve-icon
https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b cve-icon cve-icon cve-icon
https://github.com/rails/rails/releases/tag/v7.2.3.1 cve-icon cve-icon cve-icon
https://github.com/rails/rails/releases/tag/v8.0.4.1 cve-icon cve-icon cve-icon
https://github.com/rails/rails/releases/tag/v8.1.2.1 cve-icon cve-icon cve-icon
https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-33174 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-33174 cve-icon
History

Tue, 24 Mar 2026 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Rubyonrails
Rubyonrails rails
CPEs cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
Vendors & Products Rubyonrails
Rubyonrails rails
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Tue, 24 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 24 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Tue, 24 Mar 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Rails
Rails activestorage
Vendors & Products Rails
Rails activestorage

Tue, 24 Mar 2026 02:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
Weaknesses CWE-789
References
Metrics cvssV4_0

{'score': 6.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-24T13:40:32.031Z

Reserved: 2026-03-17T22:16:36.719Z

Link: CVE-2026-33174

cve-icon Vulnrichment

Updated: 2026-03-24T13:40:27.286Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-24T00:16:28.630

Modified: 2026-03-24T17:55:58.230

Link: CVE-2026-33174

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-23T23:24:55Z

Links: CVE-2026-33174 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-24T10:29:57Z

Weaknesses