CVE-2023-25576

@fastify/multipart vulnerable to DoS due to unlimited number of parts

HIGH
7.5
CVSS Score
Published: February 14, 2023 at 03:04 PM UTC
Updated: June 17, 2026 at 05:41 AM UTC
1 product affected across 1 vendorFastify Multipart

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

@fastify/multipart is a Fastify plugin to parse the multipart content-type. Prior to versions 7.4.1 and 6.0.1, @fastify/multipart may experience denial of service due to a number of situations in which an unlimited number of parts are accepted. This includes the multipart body parser accepting an unlimited number of file parts, the multipart body parser accepting an unlimited number of field parts, and the multipart body parser accepting an unlimited number of empty parts as field parts. This is fixed in v7.4.1 (for Fastify v4.x) and v6.0.1 (for Fastify v3.x). There are no known workarounds.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 6.0.1v < 7.4.17.0.0 ≤ v < 7.4.1
Affected range stops below 6.0.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (5)

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-770

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