withdrawn 2026-11-04 14:42Z

This entry duplicated another and was withdrawn in its favour.

Superseded by ETK-2026-3506.

ETK-2026-3505Zero's internal tracking ID, independent of the CVE number.

withdrawn
no check availablenot proven exploitable
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
rubygems:activestorage >= 8.1, < 8.1.4.1; < 8.0.5.2
fixed in 8.1.4.1, 8.0.5.2
CWE-1188 Initialization of a Resource with an Insecure Default
ETK-2026-3505Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:gem/activestorage
1h 33msince last run
–AI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org, not yet published
0
+2h
+4h
+6h
+8h
+10h
+12h

description

Active Storage applications using MiniMagick/ImageMagick for image processing may allow untrusted uploaders to cause arbitrary file writes. Applications using the Disk service may also expose files readable by the application process. Exposure requires untrusted uploads and an ImageMagick security policy that does not already block the relevant coders.

mitigation

Upgrade activestorage to 8.1.4.1 or 8.0.5.2 and ensure MiniMagick is at least 5.1 when using the MiniMagick variant processor. If an immediate upgrade is not possible, apply the fixed release's ImageMagick policy rules in the system policy.

fixed in 8.1.4.1, 8.0.5.2

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
–
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
–
cve.org record, t = 0The moment cve.org publishes the CVE in full.
not published yet
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

No artifact: no remotely reachable path found.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

No signals recorded for this entry yet.

this entry in the feed

GET /api/v1/feed/ETK-2026-3505

{
  "etk_id": "ETK-2026-3505",
  "cve_id": null,
  "display_id": "ETK-2026-3505",
  "ghsa_id": null,
  "euvd_id": null,
  "status": "retired",
  "anchor_state": "awaiting_cve",
  "title": "Arbitrary file access through Active Storage ImageMagick processing",
  "summary": "Active Storage applications using MiniMagick/ImageMagick for image processing may allow untrusted uploaders to cause arbitrary file writes. Applications using the Disk service may also expose files readable by the application process. Exposure requires untrusted uploads and an ImageMagick security policy that does not already block the relevant coders.",
  "mitigation": "Upgrade activestorage to 8.1.4.1 or 8.0.5.2 and ensure MiniMagick is at least 5.1 when using the MiniMagick variant processor. If an immediate upgrade is not possible, apply the fixed release's ImageMagick policy rules in the system policy.",
  "vendor": "rubygems",
  "product": "rubygems:activestorage",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.1, < 8.1.4.1"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "8.1.4.1"
      ],
      "package_name": "activestorage",
      "purl": "pkg:gem/activestorage"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 8.0.5.2"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "8.0.5.2"
      ],
      "package_name": "activestorage",
      "purl": "pkg:gem/activestorage"
    }
  ],
  "cwes": [
    1188
  ],
  "cvss_score": 9.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": null,
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": null,
  "t0_at": null,
  "signals": {}
}

published 2026-11-04 14:25Z
last change 2026-11-04 14:49Z

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