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CVE-2026-109478

CVE-2026-109478

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

GHSA-r3qf-p3jm-8h4p ↗EUVD-2026-121561 ↗

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.
nuget:Microsoft.AspNetCore.App.Runtime.linux-arm >= 8.0.0-preview.1.23112.2, <= 8.0.33; = 9.0.0-preview.1.24081.5; = 9.0.0-preview.2.24128.4; = 9.0.0-preview.3.24172.13
fixed in 8.0.34, 9.0.0-preview.4.24267.6
CWE-407 Inefficient Algorithmic Complexity
ETK-2026-4118Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.osx-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.osx-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x86
cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8h 59msince last run
10mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org publication
trigger signal (cve.org) +0hwaiting for further signals+5h42m
0
+2h
+4h
+8h
+10h
+12h

description

Affected ASP.NET Core runtime packages can consume excessive memory while handling comma-separated HTTP header values. An unauthenticated network attacker may cause denial of service when an affected application processes attacker-supplied HTTP requests.

mitigation

Update affected .NET 8 runtime packages to 8.0.34 or later, or affected .NET 9 preview packages to 9.0.0-preview.4.24267.6 or later. Redeploy applications with the updated runtime packages.

fixed in 8.0.34, 9.0.0-preview.4.24267.6

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
10m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-11-10 18:15Z
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.
–

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.

  1. 2026-11-10 18:15Z
  2. 2026-11-10 18:15Z

this entry in the feed

GET /api/v1/feed/CVE-2026-109478

{
  "etk_id": "ETK-2026-4118",
  "cve_id": "CVE-2026-109478",
  "display_id": "CVE-2026-109478",
  "ghsa_id": "GHSA-r3qf-p3jm-8h4p",
  "euvd_id": "EUVD-2026-121561",
  "status": "published",
  "anchor_state": "anchored",
  "title": "ASP.NET Core HTTP header parsing resource exhaustion",
  "summary": "Affected ASP.NET Core runtime packages can consume excessive memory while handling comma-separated HTTP header values. An unauthenticated network attacker may cause denial of service when an affected application processes attacker-supplied HTTP requests.",
  "mitigation": "Update affected .NET 8 runtime packages to 8.0.34 or later, or affected .NET 9 preview packages to 9.0.0-preview.4.24267.6 or later. Redeploy applications with the updated runtime packages.",
  "vendor": "nuget",
  "product": "nuget:Microsoft.AspNetCore.App.Runtime.linux-arm",
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  ],
  "cwes": [
    407
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 9.745578666666667,
  "t0_at": "2026-11-10T18:15:23.710000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-10T18:15:23.710000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T18:15:23.710000+00:00",
      "url": "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-r3qf-p3jm-8h4p"
    }
  }
}

published 2026-11-10 23:47Z
last change 2026-11-11 07:58Z

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