← back to feed
CVE-2026-101909

CVE-2026-101909

validatedZero produced an exploit or a check.

GHSA-x97p-jq2g-jp4f ↗EUVD-2026-88392 ↗

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).+1.9dkevAttacks confirmed in the real world.
npm:axios >= 0.28.0, < 0.34.0; >= 1.15.1, < 1.20.0
fixed in 0.34.0, 1.20.0
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
ETK-2026-72, permanent identifier
pkg:npm/axios
cvss8.3cna vendorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
+1.9dTTV
13mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org publication
trigger signal (cve.org) +0dpublic poc+1.9dcheck availableagent stopped
0
+1d
+2d

description

Axios releases from 0.28.0 before 0.34.0 and from 1.15.1 before 1.20.0 can use prototype-inherited settings while serializing multipart or URL-encoded form data. An attacker who has already polluted Object.prototype in the same process may alter serialized fields or cause affected requests to fail; JSON requests and paths that do not serialize form data are unaffected.

mitigation

Upgrade axios to 0.34.0 or later on the 0.x line, or to 1.20.0 or later on the 1.x line. Until upgrading, avoid form serialization in processes with known prototype pollution and explicitly provide serializer settings as own properties.

fixed in 0.34.0, 1.20.0

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.
0.35%27th percentile
agent run time
13m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-28 17:42Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
+1.9d
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. 2026-09-28 17:42Z
  2. 2026-09-28 17:42Z
  3. 2026-09-30 15:02Z

this entry in the feed

GET /api/v1/feed/CVE-2026-101909

{
  "etk_id": "ETK-2026-72",
  "cve_id": "CVE-2026-101909",
  "display_id": "CVE-2026-101909",
  "ghsa_id": "GHSA-x97p-jq2g-jp4f",
  "euvd_id": "EUVD-2026-88392",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Prototype-pollution option inheritance in axios form serialization",
  "summary": "Axios releases from 0.28.0 before 0.34.0 and from 1.15.1 before 1.20.0 can use prototype-inherited settings while serializing multipart or URL-encoded form data. An attacker who has already polluted Object.prototype in the same process may alter serialized fields or cause affected requests to fail; JSON requests and paths that do not serialize form data are unaffected.",
  "mitigation": "Upgrade axios to 0.34.0 or later on the 0.x line, or to 1.20.0 or later on the 1.x line. Until upgrading, avoid form serialization in processes with known prototype pollution and explicitly provide serializer settings as own properties.",
  "vendor": "npm",
  "product": "npm:axios",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.28.0, < 0.34.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "0.34.0"
      ],
      "package_name": "axios",
      "purl": "pkg:npm/axios"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.15.1, < 1.20.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "1.20.0"
      ],
      "package_name": "axios",
      "purl": "pkg:npm/axios"
    }
  ],
  "cwes": [
    1321
  ],
  "cvss_score": 8.3,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0035,
  "epss_percentile": 0.2767,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 12.896652833333333,
  "t0_at": "2026-09-28T17:42:40.203000+00:00",
  "signals": {
    "check": {
      "at": "2026-09-30T15:42:48.117494+00:00",
      "days": 1.9167582696064815,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T17:42:40.203000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-09-30T15:02:45+00:00",
      "days": 1.888944409722222,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T17:42:40.203000+00:00",
      "url": "https://github.com/advisories/GHSA-x97p-jq2g-jp4f"
    },
    "trigger_signal": {
      "at": "2026-09-28T17:42:40.203000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T17:42:40.203000+00:00",
      "url": "https://github.com/axios/axios/security/advisories/GHSA-x97p-jq2g-jp4f"
    }
  }
}

published 2026-09-30 03:02Z
last change 2026-10-21 07:05Z

Need the technical details behind an entry?

Every entry here shows what we attempted and when. The technical details, the generated exploit that fired it and the evidence behind the verdict are not public. Tell us about your use case and we’ll get back to you about extended API access.

Protected by reCAPTCHA; the Google Privacy Policy and Terms of Service apply.