CVE-2026-19484 @fastify/busboy vulnerable to Denial of Service via oversized multipart boundary

@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...

CVE-2026-19484

@fastify/busboy versions 3.1.0–3.2.0 are vulnerable to a Denial of Service via crafted multipart boundaries. The root cause is a fixed 256-entry skip table in the vendored streaming search; a boundary of exactly 252 bytes makes the search needle 256 bytes, truncating the skip distance to zero and...

CVE-2026-19484 @fastify/busboy vulnerable to Denial of Service via oversized multipart boundary

@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...

CVE-2026-19484

@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...

@awmottaz/grackle (>=3.0.0, <=3.2.0), @beiguancyc/parse-server (>=9.9.0-ruixiang.1, <=9.10.0-ruixiang.4) +14 more potentially affected by CVE-2026-19484 via @fastify/busboy (>=3.1.1, <=3.2.0)

@fastify/busboy NPM version =3.1.1, =3.0.0, =9.9.0-ruixiang.1, =0.37.0, =0.8.22, =0.9.21, =1.0.4, =1.0.0, =4.5.0-blowfish-pre, =11.1.1-9.0, =6.1.1, =3.31.25, =9.2.8-0, =9.10.0-1, =0.27.0, =4.0.0, =4.2.0 and more Source cves: CVE-2026-19484 Source advisory: MEND:CVE-2026-19484...

CVE-2026-19481 @fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header

@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as proto or constructor. The internal header parser stores headers in a...

0xble (>=22.0.0, <=23.2.2), 0xsodium (>=0.2.0, <=0.14.0) +14135 more potentially affected by CVE-2026-19481 via @fastify/busboy (>=1.0.0, <=3.2.0)

@fastify/busboy NPM version =1.0.0, =22.0.0, =0.2.0, =0.0.1, =1.0.0, =0.2.0, =0.4.0, =0.1.0, =0.0.1, =1.0.21, =0.6.0, =0.6.2 and more Source cves: CVE-2026-19481 Source advisory: MEND:CVE-2026-19481...

CVE-2026-19481

Summary: CVE-2026-19481 affects the multipart-form data parser in the @fastify/busboy package (versions 1.0.0–3.2.0). An attacker can submit multipart data with a part header named after a prototype-inherited property (e.g., proto , constructor), causing the header parser (which stores headers in...

CVE-2026-19481 @fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header

@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as proto or constructor. The internal header parser stores headers in a...

CVE-2026-19481

@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as proto or constructor. The internal header parser stores headers in a...

CVE-2026-19484: Loop with Unreachable Exit Condition

@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...

PT-2026-71407

Name of the Vulnerable Software and Affected Versions @fastify/busboy versions 1.0.0 through 3.2.0 Description An unauthenticated denial of service can occur when an attacker submits multipart form-data containing a part header with a name that is a prototype-inherited property, such as proto or...

CVE-2026-19481: Improper Check for Unusual or Exceptional Conditions

@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as proto or constructor. The internal header parser stores headers in a...

PT-2026-71408

Name of the Vulnerable Software and Affected Versions @fastify/busboy versions 3.1.0 through 3.2.0 Description A remote unauthenticated attacker can cause a Denial of Service by stalling the Node.js event loop. This occurs when a multipart request is sent with a boundary crafted to exactly 252...

CLSA-2026-1786387037 TuxCare security update for fastify (1 CVE)

TuxCare rebuilt fastify to address 1 CVE. Fixed in 4.29.1-tuxcare.2...

send v4.1.1

@fastify/send Send is a library for streaming files from the file system as an HTTP response supporting partial responses Ranges, conditional-GET negotiation If-Match, If-Unmodified-Since, If-None-Match, If-Modified-Since, high test coverage, and granular events which may be leveraged to take...

PT-2026-80058

TuxCare rebuilt fastify to address 1 CVE. Fixed in 4.29.1-tuxcare.2...

CVE-2026-18427

A flaw was found in @fastify/static. An unauthenticated attacker can bypass route-based guards by using non-canonical path segments in a request. This allows the attacker to access and disclose the contents of files that should be protected by these guards. The vulnerability stems from the static...

@appweaver/core (>=1.1.6, <=1.6.1), @cappa/cli (>=0.11.1, <=0.12.0) +37 more potentially affected by CVE-2026-18427 via @fastify/static (>=10.1.0, <=10.1.2)

@fastify/static NPM version =10.1.0, =1.1.6, =0.11.1, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =0.0.4, =0.0.6 - @darthcav/ts-http-server 0.9.1 -...

Directory Traversal

Overview @fastify/static is a Plugin for serving static files as fast as possible. Affected versions of this package are vulnerable to Directory Traversal via the static file handler process. An attacker can access protected files by submitting requests with non-canonical path segments, such as d...