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4 vulnerabilities by @fastify/busboy
CVE-2026-19484 (GCVE-0-2026-19484)
Vulnerability from nvd – Published: 2026-08-13 08:50 – Updated: 2026-08-13 14:27
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary
Summary
@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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:26 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
3.1.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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CVE-2026-19481 (GCVE-0-2026-19481)
Vulnerability from nvd – Published: 2026-08-13 08:31 – Updated: 2026-08-13 14:25
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header
Summary
@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 plain JavaScript object and assumes each value is an array, so an inherited property name resolves to a truthy non-array value and triggers a TypeError. In the common pipe integration the failure surfaces as an error event, but in direct write or end usage the exception is thrown synchronously and can terminate the Node.js process, causing an unauthenticated denial of service. The issue is fixed in @fastify/busboy 3.2.1, which creates the header object with a null prototype. Users should upgrade to 3.2.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:25 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
1.0.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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CVE-2026-19484 (GCVE-0-2026-19484)
Vulnerability from cvelistv5 – Published: 2026-08-13 08:50 – Updated: 2026-08-13 14:27
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary
Summary
@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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:26 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
3.1.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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CVE-2026-19481 (GCVE-0-2026-19481)
Vulnerability from cvelistv5 – Published: 2026-08-13 08:31 – Updated: 2026-08-13 14:25
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header
Summary
@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 plain JavaScript object and assumes each value is an array, so an inherited property name resolves to a truthy non-array value and triggers a TypeError. In the common pipe integration the failure surfaces as an error event, but in direct write or end usage the exception is thrown synchronously and can terminate the Node.js process, causing an unauthenticated denial of service. The issue is fixed in @fastify/busboy 3.2.1, which creates the header object with a null prototype. Users should upgrade to 3.2.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:25 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
1.0.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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