CVE-2026-87908: high-severity vulnerability in multiparty
multiparty vulnerable to Denial of Service via unbounded part-header accumulation
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
multiparty is a Node.js library for parsing multipart/form-data request bodies. In versions from 2.1.0 up to but not including 4.3.1, the parser does not bound the amount of memory used while accumulating the headers of a single multipart part. An unauthenticated attacker can send a single request whose part carries a very large volume of header bytes, forcing the parser to buffer all of them and exhausting the process memory, which crashes the server. This is a denial of service with no confidentiality or integrity impact. The issue is fixed in multiparty 4.3.1, which caps the size of the accumulated part headers. Users should upgrade to multiparty 4.3.1 or later.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
multiparty · multipartyRelated CVEs — multiparty
In the same product, most dangerous first.
CVE-2026-8161HIGHmultiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught ExceptionEPSS 0.5%CVE-2026-8159HIGHmultiparty vulnerable to ReDoS via filename parsingEPSS 0.3%CVE-2026-8162HIGHmultiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsingEPSS 0.3%