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CVE-2026-74866 (GCVE-0-2026-74866)

Vulnerability from cvelistv5

Published

2026-08-21 08:20

Modified

2026-08-21 12:37

Severity ?

5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Summary

@fastify/busboy is a multipart form-data parser for Node.js. Its multipart part-header parser splits header lines only on the two-byte carriage-return line-feed sequence, so a lone carriage return or line feed embedded in a part header is not treated as a line break and is carried verbatim into the parsed Content-Disposition filename and field name handed to the application. An attacker who uploads a file whose filename or field name contains a bare carriage return or line feed can inject control characters into consumers that trust the parser to return clean values, enabling filesystem filename pollution, log forging, or header injection when the value is forwarded to a carriage-return-sensitive sink. All versions of @fastify/busboy up to and including 3.2.1 are affected. The issue is fixed in version 3.2.2, which rejects any header line that still contains a bare carriage return or line feed. Users should upgrade to 3.2.2, and consumers such as @fastify/multipart should bump their @fastify/busboy dependency to pull in the fix.

References

URL

Tags

	https://github.com/fastify/busboy/security/advisories/GHSA-gxm5-99cw-xjw9
	https://cna.openjsf.org/security-advisories.html

Impacted products

	Vendor	Product	Version
	@fastify/busboy	@fastify/busboy	Version: 0 ≤

Show details on NVD website

JSON

To clipboard

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CVE-2026-19484 (GCVE-0-2026-19484)

Vulnerability from cvelistv5

Published

2026-08-13 08:50

Modified

2026-08-13 14:27

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-1322 - Use of Blocking Code in Single-threaded, Non-blocking Context

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.

References

URL

Tags

	https://github.com/fastify/busboy/security/advisories/GHSA-xjh9-v7x6-24jw
	https://cna.openjsf.org/security-advisories.html

Impacted products

	Vendor	Product	Version
	@fastify/busboy	@fastify/busboy	Version: 3.1.0 ≤

Show details on NVD website

JSON

To clipboard

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CVE-2026-19481 (GCVE-0-2026-19481)

Vulnerability from cvelistv5

Published

2026-08-13 08:31

Modified

2026-08-13 14:25

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-754 - Improper Check for Unusual or Exceptional Conditions

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.

References

URL

Tags

	https://github.com/fastify/busboy/security/advisories/GHSA-x8mw-p69m-v3mx
	https://cna.openjsf.org/security-advisories.html

Impacted products

	Vendor	Product	Version
	@fastify/busboy	@fastify/busboy	Version: 1.0.0 ≤

Show details on NVD website

JSON

To clipboard

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Refine your search

3 vulnerabilities found for @fastify/busboy by @fastify/busboy

CVE-2026-74866 (GCVE-0-2026-74866)

Vulnerability from cvelistv5

CVE-2026-19484 (GCVE-0-2026-19484)

Vulnerability from cvelistv5

CVE-2026-19481 (GCVE-0-2026-19481)

Vulnerability from cvelistv5