CVE•Published 2026-05-12•Modified 2026-05-13•0 articles on news•6 live references•NVD data

CVE-2026-8161Pillarjs · Multiparty

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

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Weaknesses (CWE)

CWE-248Uncaught Exception CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Description

multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.

Timeline

Published 2026-05-12

Modified 2026-05-13

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-8161

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Pillarjs Multiparty"

All exposed Pillarjs Multiparty instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Multiparty"

HTTP body or banner mentions "Multiparty" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-8161