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CVE-2026-33658
Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests
Low2.3EPSS 0.45%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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 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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | Low2.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U |
| NVDNVD · Analyzed | 4.0 | Low2.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.45% · top 61% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.3.
Weakness
Affected products
- affected >= 8.1.0, < 8.1.2.1
- affected >= 8.0.0, < 8.0.4.1
- affected < 7.2.3.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- RubyGemsactivestorageGHSA-p9fm-f462-ggrg (opens in a new tab)
References (5)
- https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg (opens in a new tab)x_refsource_CONFIRM
- https://github.com/rails/rails/releases/tag/v7.2.3.1 (opens in a new tab)x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v8.0.4.1 (opens in a new tab)x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v8.1.2.1 (opens in a new tab)x_refsource_MISC
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-p9fm-f462-ggrg (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-33658)Record last updated .