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CVE-2026-13639

CVE-2026-13639

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

GHSA-q2v9-22q3-c377 ↗EUVD-2026-82774 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.+41d
Synology DiskStation Manager (DSM) >= 7.4, < 7.4-90075; >= 7.3.2, < 7.3.2-86009-4; >= 7.2.2, < 7.2.2-72806-9; >= 7.2.1, < 7.2.1-69057-12
fixed in 7.4-90075, 7.3.2-86009-4, 7.2.2-72806-9, 7.2.1-69057-12
ETK-2026-3988Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss9.8otherCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1d 08h 44msince last run
1h 27mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
cve.org publication−41dtrigger signal +0dkev+1.0dwaiting for further signals+12d
−30d
−20d
−10d

description

Synology DiskStation Manager releases before the listed updates have weak randomness in their login handling. An unauthenticated remote attacker who can reach the DSM login service may read or modify files or cause a denial of service.

mitigation

Update DSM to 7.4-90075, 7.3.2-86009-4, 7.2.2-72806-9, or 7.2.1-69057-12, as appropriate for the deployed release line. Restrict network access to DSM management and login services until updates are installed.

fixed in 7.4-90075, 7.3.2-86009-4, 7.2.2-72806-9, 7.2.1-69057-12

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.
0.67%52nd percentile
agent run time
1h 27m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-18 08:21Z
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.
+41d

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. 2026-09-18 08:21Z
  2. 2026-10-29
    vulncheck_kev: trigger signal, started the run
    https://vulncheck.com/cve/CVE-2026-13639
  3. 2026-10-29 00:00Z

this entry in the feed

GET /api/v1/feed/CVE-2026-13639

{
  "etk_id": "ETK-2026-3988",
  "cve_id": "CVE-2026-13639",
  "display_id": "CVE-2026-13639",
  "ghsa_id": "GHSA-q2v9-22q3-c377",
  "euvd_id": "EUVD-2026-82774",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Insufficient login entropy in Synology DiskStation Manager",
  "summary": "Synology DiskStation Manager releases before the listed updates have weak randomness in their login handling. An unauthenticated remote attacker who can reach the DSM login service may read or modify files or cause a denial of service.",
  "mitigation": "Update DSM to 7.4-90075, 7.3.2-86009-4, 7.2.2-72806-9, or 7.2.1-69057-12, as appropriate for the deployed release line. Restrict network access to DSM management and login services until updates are installed.",
  "vendor": "Synology",
  "product": "DiskStation Manager (DSM)",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 7.4, < 7.4-90075",
        ">= 7.3.2, < 7.3.2-86009-4",
        ">= 7.2.2, < 7.2.2-72806-9",
        ">= 7.2.1, < 7.2.1-69057-12"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "7.4-90075",
        "7.3.2-86009-4",
        "7.2.2-72806-9",
        "7.2.1-69057-12"
      ],
      "package_name": "DiskStation Manager (DSM)",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 9.8,
  "cvss_src": "other",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": 0.0067,
  "epss_percentile": 0.5208,
  "epss_asof": "2026-11-09",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 87.25065611666666,
  "t0_at": "2026-09-18T08:21:27.534000+00:00",
  "signals": {
    "kev": {
      "at": "2026-10-29T00:00:00+00:00",
      "days": 41,
      "is_lower_bound": false,
      "measured_at": "2026-09-18T08:21:27.534000+00:00",
      "precision": "day",
      "url": "https://vulncheck.com/cve/CVE-2026-13639"
    },
    "trigger_signal": {
      "at": "2026-10-29T00:00:00+00:00",
      "days": 40.65176465277778,
      "is_lower_bound": false,
      "measured_at": "2026-09-18T08:21:27.534000+00:00",
      "url": "https://vulncheck.com/cve/CVE-2026-13639"
    }
  }
}

published 2026-11-09 20:34Z
last change 2026-11-11 01:54Z

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