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CVE-2026-100397

CVE-2026-100397

waiting for further signalsZero needs more public information before it can validate it.

GHSA-x585-4vv8-2mh2 ↗

no check availablenot proven exploitable
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−5h41mkevAttacks confirmed in the real world.
pip:rucio >= 1.14.0.post1, < 35.9.1; >= 36.0.0rc1, < 38.6.1; >= 39.0.0rc1, < 40.4.2; >= 41.0.0rc1, < 41.1.1
fixed in 35.9.1, 38.6.1, 40.4.2, 41.1.1
ETK-2026-4337Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:pypi/rucio
cvss9.8cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4h 44msince last run
53mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org, not yet published
trigger signal −5h41mpublic poc−5h41mwaiting for further signals−4h44m
−4h
−2h
0

description

Rucio releases before the listed fixed versions can treat SSH challenge tokens as valid API authentication credentials. An unauthenticated attacker can obtain a short-lived challenge token for an arbitrary account and use it to access API endpoints as that account. Exposure requires the affected Rucio authentication API to be reachable.

mitigation

Upgrade Rucio to 35.9.1, 38.6.1, 40.4.2, or 41.1.1, as appropriate for your release branch. Until upgraded, restrict access to the Rucio authentication and API endpoints to trusted networks.

fixed in 35.9.1, 38.6.1, 40.4.2, 41.1.1

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
53m
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).
−5h41m
Δ to kevAttacks confirmed in the real world.
–

outcome

No artifact: an exploit or check was attempted but could not be produced at this moment.

source signals

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

  1. 2026-11-13 01:09Z
    ghsa: trigger signal, started the run
    https://github.com/advisories/GHSA-x585-4vv8-2mh2
  2. 2026-11-13 01:09Z

this entry in the feed

GET /api/v1/feed/CVE-2026-100397

{
  "etk_id": "ETK-2026-4337",
  "cve_id": "CVE-2026-100397",
  "display_id": "CVE-2026-100397",
  "ghsa_id": "GHSA-x585-4vv8-2mh2",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Authentication bypass through SSH challenge tokens in Rucio",
  "summary": "Rucio releases before the listed fixed versions can treat SSH challenge tokens as valid API authentication credentials. An unauthenticated attacker can obtain a short-lived challenge token for an arbitrary account and use it to access API endpoints as that account. Exposure requires the affected Rucio authentication API to be reachable.",
  "mitigation": "Upgrade Rucio to 35.9.1, 38.6.1, 40.4.2, or 41.1.1, as appropriate for your release branch. Until upgraded, restrict access to the Rucio authentication and API endpoints to trusted networks.",
  "vendor": "pip",
  "product": "pip:rucio",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.14.0.post1, < 35.9.1"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "35.9.1"
      ],
      "package_name": "rucio",
      "purl": "pkg:pypi/rucio"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 36.0.0rc1, < 38.6.1"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "38.6.1"
      ],
      "package_name": "rucio",
      "purl": "pkg:pypi/rucio"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 39.0.0rc1, < 40.4.2"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "40.4.2"
      ],
      "package_name": "rucio",
      "purl": "pkg:pypi/rucio"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 41.0.0rc1, < 41.1.1"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "41.1.1"
      ],
      "package_name": "rucio",
      "purl": "pkg:pypi/rucio"
    }
  ],
  "cwes": null,
  "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": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 53.2552038,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-11-13T01:09:54+00:00",
      "days": -0.2367816449652778,
      "is_lower_bound": true,
      "measured_at": "2026-11-13T06:50:52.001273+00:00",
      "url": "https://github.com/advisories/GHSA-x585-4vv8-2mh2"
    },
    "trigger_signal": {
      "at": "2026-11-13T01:09:54+00:00",
      "days": -0.2367816449652778,
      "is_lower_bound": true,
      "measured_at": "2026-11-13T06:50:52.001273+00:00",
      "url": "https://github.com/advisories/GHSA-x585-4vv8-2mh2"
    }
  }
}

published 2026-11-13 01:27Z
last change 2026-11-13 06:43Z

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