CVE-2026-8162

HIGH 7.5

multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

[email protected] and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a Content-Disposition header whose filename* parameter contains a malformed percent-encoding, the parser invokes decodeURI on the value without try/catch. The resulting URIError propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to [email protected] or higher.

CWE	CWE-755
Vendor	multiparty
Product	multiparty
Published	May 12, 2026
Last Updated	May 12, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

multiparty / multiparty

0 ≤ 4.2.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/pillarjs/multiparty/security/advisories/GHSA-xh3c-6gcq-g4rv cna.openjsf.org: https://cna.openjsf.org/security-advisories.html

Credits

🔍 Byambadalai Sumiya Blake Embrey Ulises Gascón