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CVE-2026-105830

CVE-2026-105830

validatedZero produced an exploit or a check.

GHSA-3q6v-r5mr-hxv8 ↗EUVD-2026-95017 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−17dkevAttacks confirmed in the real world.
thephpleague commonmark >= 2.0.0, <= 2.10.1
fixed in 2.10.2
CWE-400 Uncontrolled Resource Consumption
ETK-2026-982, permanent identifier
pkg:composer/league/commonmark
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
+1h14mTTV
18mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
public poc−17dtrigger signal (cve.org) +0dcheck available+0.1dagent stopped
−15d
−10d
−5d

description

league/commonmark versions 2.0.0 through before 2.10.2 are affected by a quadratic-time denial-of-service issue in GitHub Flavored Markdown table parsing. An unauthenticated attacker who can submit Markdown for processing can cause excessive PHP worker CPU consumption.

mitigation

Upgrade the commonmark package to version 2.10.2 or later. Until upgraded, restrict or rate-limit untrusted Markdown submissions to reduce exposure.

fixed in 2.10.2

check
available
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.
0.37%29th percentile
agent run time
18m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-08 14:10Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
−17d
Δ to kevAttacks confirmed in the real world.
–

outcome

Mechanism verified: the exploit fired on the vulnerable build and stayed silent on the patched one, but the server it ran against was ours, so no check ships for it.

source signals

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

  1. 2026-09-21 12:30Z
  2. 2026-10-08 14:10Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-105830

this entry in the feed

GET /api/v1/feed/CVE-2026-105830

{
  "etk_id": "ETK-2026-982",
  "cve_id": "CVE-2026-105830",
  "display_id": "CVE-2026-105830",
  "ghsa_id": "GHSA-3q6v-r5mr-hxv8",
  "euvd_id": "EUVD-2026-95017",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Quadratic-time denial of service in league/commonmark tables",
  "summary": "league/commonmark versions 2.0.0 through before 2.10.2 are affected by a quadratic-time denial-of-service issue in GitHub Flavored Markdown table parsing. An unauthenticated attacker who can submit Markdown for processing can cause excessive PHP worker CPU consumption.",
  "mitigation": "Upgrade the commonmark package to version 2.10.2 or later. Until upgraded, restrict or rate-limit untrusted Markdown submissions to reduce exposure.",
  "vendor": "thephpleague",
  "product": "commonmark",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.0.0, <= 2.10.1"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "2.10.2"
      ],
      "package_name": "league/commonmark",
      "purl": "pkg:composer/league/commonmark"
    }
  ],
  "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": 0.0037,
  "epss_percentile": 0.2917,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 17.507152083333335,
  "t0_at": "2026-10-08T14:10:31.055000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-08T15:24:39.698616+00:00",
      "days": 0.05148893074074074,
      "is_lower_bound": false,
      "measured_at": "2026-10-08T14:10:31.055000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-09-21T12:30:10+00:00",
      "days": -17.069688136574076,
      "is_lower_bound": false,
      "measured_at": "2026-10-08T14:10:31.055000+00:00",
      "url": "https://github.com/thephpleague/commonmark/security/advisories/GHSA-3q6v-r5mr-hxv8"
    },
    "trigger_signal": {
      "at": "2026-10-08T14:10:31.055000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-08T14:10:31.055000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-105830"
    }
  }
}

published 2026-10-08 15:07Z
last change 2026-10-21 16:15Z

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