CVE-2026-33658
Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests
No known exploitation. EPSS puts it in the 40th percentile. Fixed in 7.2.3.1.
No public exploit knownFix7.2.3.1Upgrade to this build
e.g. OID 1.3.6.1.4.1.25623.1.1.1.1.2026.6546
What to do
Find your product and version, then upgrade to the build on the right.
- Rails ActivestorageAffected: >= 8.1.0, < 8.1.2.1Upgrade to: not statedAffected: >= 8.0.0, < 8.0.4.1Upgrade to: not statedAffected: < 7.2.3.1Upgrade to: not statedStated by: CVE record
- Rubyonrails RailsAffected: < 7.2.3.1Upgrade to: 7.2.3.1Stated by: NVD
- ООО «Ред Софт» РЕД ОСAffected: 7.3Upgrade to: not statedStated by: BDU
- Red Hat Inc. Red Hat SatelliteAffected: 6Upgrade to: not statedStated by: BDU
- Rails Core Team Ruby on RailsAffected: до 7.2.3.1Upgrade to: not statedStated by: BDU
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.5% chance of exploitation activity in the next 30 days, which ranks it in the 40th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
6 events over 210 days, from the signal feeds we watch.
- OpenVAS check added
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Scored 6.5 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity NoneNo integrity impact
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
- github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
- github.com/rails/rails/releases/tag/v7.2.3.1
- github.com/rails/rails/releases/tag/v8.0.4.1
And 10 more references. See all after sign-in
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