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No exploitation reportedFix available

CVE-2026-33174

No exploitation reported by the sources we read.

  • Published2026-03-24
  • Fixed in8.1.2.1 · 8.0.4.1 · 7.2.3.1
  • WeaknessCWE-789

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-03-2400:16CVE publishedNVD

Versions per branch

NVD · OSV
Ruby on Rails
BranchAffectedFixed in
8.1≥ 8.1.0, < 8.1.2.18.1.2.1
8.1≥ 8.1.0.beta1, < 8.1.2.18.1.2.1
8.0≥ 8.0.0, < 8.0.4.18.0.4.1
8.0≥ 8.0.0.beta1, < 8.0.4.18.0.4.1
7.2< 7.2.3.17.2.3.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • rails activestorage
    Affected
    • = >= 8.1.0.beta1, < 8.1.2.1no fix stated
    • = >= 8.0.0.beta1, < 8.0.4.1no fix stated
    • = < 7.2.3.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-23

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • gitlab-rails-ce-18.1Chainguardall versions · no fixed version listedand 12 other packages
  • gitlab-rails-ce-18.10Chainguardall versions · fixed in 18.10.3-r1
  • gitlab-rails-ce-18.8Chainguardall versions · fixed in 18.8.11-r4
  • gitlab-rails-ce-18.9Chainguardall versions · fixed in 18.9.5-r0and 1 other package
  • gitlab-rails-ce-fips-18.10Chainguardall versions · fixed in 18.10.3-r0
  • railsUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • railsUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • railsUbuntu:Pro:18.04:LTSall versions · no fixed version listed

10 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Ruby on Rails to 8.1.2.1 · 8.0.4.1 · 7.2.3.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-03-24
  • CNACVSS 4.06.6known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-789known since 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-03-23

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 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/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
Published
2026-03-24
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-r46p-8f7g-vvvg

Frequently asked questions

What is CVE-2026-33174?

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.

Is CVE-2026-33174 actively exploited?

Active exploitation of CVE-2026-33174 has not been confirmed. Its EPSS score was 0.6% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-33174?

CVE-2026-33174 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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