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CVE-2026-33174

Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
rails / activestorageaffected >= 8.1.0.beta1, < 8.1.2.1; affected >= 8.0.0.beta1, < 8.0.4.1; affected < 7.2.3.1

CWE

CWE-789

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.