High [CVE-2026-19484] Denial of Service via oversized multipart boundary
This high-severity Red Hat Linux advisory covers CVE-2026-19484.
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Summary
A flaw was found in @fastify/busboy, a multipart form-data parser. A remote, unauthenticated attacker can exploit this by sending a specially crafted multipart request with an oversized boundary.
This can cause the Node.js event loop to stall, leading to a CPU-bound loop that consumes significant processing resources. Consequently, a single small request can keep a core busy and deny service to other requests handled by the same process.
Red Hat products that include @fastify/busboy are not affected by this vulnerability. CVE-2026-19484 is present only in @fastify/busboy versions 3.1.0 through 3.2.0.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-606.
Red Hat lists OpenShift Pipelines; Red Hat AMQ Broker 7; Red Hat Ceph Storage 8; Red Hat Ceph Storage 9; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Container Platform 4 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
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