CVE-2026-8162Network attack vector

Unauthenticated process crash via malformed filename encoding

Published May 12, 2026 · Updated May 12, 2026

Denial of service in PillarJS multiparty 4.2.3 and earlier allows remote attackers to crash Node.js services via multipart uploads. The filename* parser passes malformed percent-encoded header data to decodeURI without exception handling, allowing URIError to escape. Any unauthenticated request path that parses multipart uploads with the library can terminate the hosting process and interrupt that service.

CVSS severity7.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in PillarJS multiparty 4.2.3 and earlier allows remote attackers to crash Node.js services via multipart uploads. The filename* parser passes malformed percent-encoded header data to decodeURI without exception handling, allowing URIError to escape. Any unauthenticated request path that parses multipart uploads with the library can terminate the hosting process and interrupt that service.

The record

CVE
CVE-2026-8162
Published
May 12, 2026
Updated
May 12, 2026
Vendor
PillarJS
Product
multiparty
Classifications
CWE-755, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PillarJS · multipartyversion=0 <=4.2.3

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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