EUVD-2026-57759Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attacker fully controls boundary length in their own request, so AC:L; no authentication per PR:N; only availability impacted.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
@fastify/busboy is a multipart form-data parser. In versions 3.1.0 through 3.2.0, a remote unauthenticated attacker can stall the Node.js event loop by sending a multipart request whose boundary is crafted to a specific length. The vendored streaming search stores its skip table in a fixed 256 entry byte array, and a boundary of exactly 252 bytes makes the search needle 256 bytes, which truncates the default skip distance to zero and turns the search into a CPU bound loop on a small body. A single small request can keep one core busy and deny service to other requests handled by the same process. The issue is fixed in @fastify/busboy 3.2.1, which widens the skip table so the skip distance is preserved. Users should upgrade to 3.2.1.
Articles & Coverage 2
AnalysisAI
CPU exhaustion in @fastify/busboy 3.1.0-3.2.0 allows a remote unauthenticated attacker to stall the Node.js event loop by sending a single crafted multipart request. The parser's vendored streaming search algorithm stores its Boyer-Moore-style skip table in a fixed 256-entry byte array; supplying a boundary of exactly 252 bytes causes the computed search needle to reach 256 bytes, collapsing the skip distance to zero and converting an O(n) search into an unbounded CPU-bound loop. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The application must be accepting HTTP multipart/form-data POST requests - meaning it must expose at least one route that parses request bodies using @fastify/busboy 3.1.0 through 3.2.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H accurately reflects the attack surface: no authentication, no special preconditions beyond a reachable multipart endpoint, and high availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a single HTTP POST request to any endpoint served by the vulnerable application that accepts multipart/form-data input, setting the Content-Type boundary parameter to a string of exactly 252 bytes and including a minimal body. The @fastify/busboy parser begins scanning for the boundary marker, computes a zero skip distance due to the table truncation bug, and enters a CPU-bound spin loop. … |
| Remediation | The primary fix is to upgrade @fastify/busboy to version 3.2.1, which widens the internal skip table so that the skip distance is correctly preserved regardless of boundary length. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all deployments running @fastify/busboy 3.1.0-3.2.0 and classify affected services by criticality. …
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