High 7.5Published May 12, 2026

CVE-2026-8162multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing

Updated under an hour ago (Oct 26, 2026, 4:30 PM ET)

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It affects multiparty and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 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 multiparty@4.3.0 or higher.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-755
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: openjs
NVD analysis: Analyzed
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

multiparty multiparty multiparty:multiparty (from the name)	through 4.2.3; 4.3.0 not affected	CNA record
pillarjs multiparty pillarjs:multiparty	before 4.3.0	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.