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CVE

CVE-2026-33174

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

CVE-2026-33174

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

Impact

When serving files through Active Storage's Blobs::ProxyController, the 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.

Releases

The fixed releases are available at the normal locations.

Credit

This issue was responsibly reported by Hackerone user pirikara

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
6.6
-
4.0
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/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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg, https://nvd.nist.gov/vuln/detail/CVE-2026-33174, https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5, https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a, https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b, https://github.com/rails/rails, 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/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33174.yml

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00023%
EPSS Percentile
0.0688%
Introduced Version
8.1.0.beta1,8.0.0.beta1,0
Fix Available
8.1.2.1,8.0.4.1,7.2.3.1,18.10.3-r1,18.9.5-r0,18.10.3-r0,8.1.3-r0,8.0.5-r0

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