CVE-2026-126082

waiting for further signals

EUVD-2026-122934 ↗

no check availablenot proven exploitable

cve.orgpublic pockev

rails >= 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-2026-4101, permanent identifier

pkg:gem/activestorage

cvss9.8cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

8h 37msince last run

22mAI analysis

timeline

0 = trigger signal

trigger signal (cve.org) +0hwaiting for further signals+1h

+2h

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description

Rails Active Storage applications using MiniMagick with untrusted file uploads may permit unauthenticated attackers to write files on the server. Deployments using the Disk storage service may also expose files readable by the application process. Exposure depends on the active ImageMagick security policy permitting the relevant coders.

mitigation

Upgrade Rails to 8.1.4.1 or 8.0.5.2. Until upgraded, restrict untrusted uploads and enforce an ImageMagick security policy that denies unnecessary coders.

fixed in 8.1.4.1, 8.0.5.2

check

exploit

automation

contextual

auth required

EPSS

–

agent run time

22m

cve.org record, t = 0

2026-11-10 21:08Z

Δ to public poc

–

Δ to kev

–

outcome

Contextual, not validated: no deterministic check could cover this one, and no technique passed our review.

source signals

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

2026-11-10 21:08Z
cve_org: trigger signal, started the run
https://www.cve.org/CVERecord?id=CVE-2026-126082

this entry in the feed

GET /api/v1/feed/CVE-2026-126082

{
  "etk_id": "ETK-2026-4101",
  "cve_id": "CVE-2026-126082",
  "display_id": "CVE-2026-126082",
  "ghsa_id": null,
  "euvd_id": "EUVD-2026-122934",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Arbitrary file read and write in Rails Active Storage",
  "summary": "Rails Active Storage applications using MiniMagick with untrusted file uploads may permit unauthenticated attackers to write files on the server. Deployments using the Disk storage service may also expose files readable by the application process. Exposure depends on the active ImageMagick security policy permitting the relevant coders.",
  "mitigation": "Upgrade Rails to 8.1.4.1 or 8.0.5.2. Until upgraded, restrict untrusted uploads and enforce an ImageMagick security policy that denies unnecessary coders.",
  "vendor": "rails",
  "product": "rails",
  "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:3.1/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": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 21.9745119,
  "t0_at": "2026-11-10T21:08:05.402000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-10T21:08:05.402000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T21:08:05.402000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-126082"
    }
  }
}

published 2026-11-10 21:46Z
last change 2026-11-11 05:12Z

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