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CVE-2026-108359

CVE-2026-108359

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

EUVD-2026-108267 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−9.9dkevAttacks confirmed in the real world.
PHPOffice PhpSpreadsheet < 1.30.7; >= 2.0.0, < 2.1.19; >= 2.2.0, < 2.4.8; >= 3.3.0, < 3.10.8; >= 4.0.0, < 5.10.0
fixed in 1.30.7, 2.1.19, 2.4.8, 3.10.8, 5.10.0
CWE-400 Uncontrolled Resource Consumption
ETK-2026-2478Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss8.7cna vendorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1h 43msince last run
12mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
public poc−9.9dtrigger signal (cve.org) +0dwaiting for further signals+0.0d
−8d
−6d
−4d
−2d

description

PhpSpreadsheet versions before 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0 can allocate excessive resources while reading crafted ODS spreadsheets. An attacker who can supply an ODS file for processing may cause high CPU and memory use that disrupts the PHP worker.

mitigation

Upgrade PhpSpreadsheet to 1.30.7, 2.1.19, 2.4.8, 3.10.8, or 5.10.0, as appropriate for the deployed release line. Until upgraded, restrict processing of untrusted ODS files.

fixed in 1.30.7, 2.1.19, 2.4.8, 3.10.8, 5.10.0

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.
contextual
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
12m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-22 17:32Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
−9.9d
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual: an exploit technique exists, but no deterministic check could cover this one.

source signals

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

  1. 2026-10-12 21:00Z
  2. 2026-10-22 17:32Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-108359

this entry in the feed

GET /api/v1/feed/CVE-2026-108359

{
  "etk_id": "ETK-2026-2478",
  "cve_id": "CVE-2026-108359",
  "display_id": "CVE-2026-108359",
  "ghsa_id": null,
  "euvd_id": "EUVD-2026-108267",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unbounded ODS row repetition resource exhaustion in PhpSpreadsheet",
  "summary": "PhpSpreadsheet versions before 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0 can allocate excessive resources while reading crafted ODS spreadsheets. An attacker who can supply an ODS file for processing may cause high CPU and memory use that disrupts the PHP worker.",
  "mitigation": "Upgrade PhpSpreadsheet to 1.30.7, 2.1.19, 2.4.8, 3.10.8, or 5.10.0, as appropriate for the deployed release line. Until upgraded, restrict processing of untrusted ODS files.",
  "vendor": "PHPOffice",
  "product": "PhpSpreadsheet",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 1.30.7",
        ">= 2.0.0, < 2.1.19",
        ">= 2.2.0, < 2.4.8",
        ">= 3.3.0, < 3.10.8",
        ">= 4.0.0, < 5.10.0"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "1.30.7",
        "2.1.19",
        "2.4.8",
        "3.10.8",
        "5.10.0"
      ],
      "package_name": "PhpSpreadsheet",
      "purl": null
    }
  ],
  "cwes": [
    400
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_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",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 12.0629041,
  "t0_at": "2026-10-22T17:32:49.724000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-10-12T21:00:57+00:00",
      "days": -9.855471342592592,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T17:32:49.724000+00:00",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-j2w7-387v-m2rq"
    },
    "trigger_signal": {
      "at": "2026-10-22T17:32:49.724000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T17:32:49.724000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-108359"
    }
  }
}

published 2026-10-22 18:12Z
last change 2026-10-22 18:56Z

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