CVE-2026-8162

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 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.

PUBLISHED Reserved 2026-05-08 | Published 2026-05-12 | Updated 2026-05-12 | Assigner openjs

Problem types

CWE-755: Improper Handling of Exceptional Conditions

Product status

Credits

Byambadalai Sumiya reporter

Blake Embrey remediation developer

Ulises Gascón remediation reviewer

References

github.com/...iparty/security/advisories/GHSA-xh3c-6gcq-g4rv

cna.openjsf.org/security-advisories.html

cve.org (CVE-2026-8162)

nvd.nist.gov (CVE-2026-8162)

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