PT-2025-17315 · Fastify · Fastify

Eomm + 2 · Published 2025-04-18 · Updated 2026-04-16 · CVE-2025-32442

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions Fastify versions 4.29.0 through 5.3.1 Fastify version 4.9.0

Description Fastify is a fast, low overhead web framework for Node.js. Applications specifying different validation strategies for different content types may bypass validation by providing a slightly altered content type, such as with different casing or altered whitespace before the semicolon (;). This issue affects applications using a specific schema pattern where individual content types are defined with their own schemas. The initial patch in version 5.3.1 did not fully address the problem, and a complete fix was released in version 5.3.2 and 4.29.1.

Recommendations Fastify versions 4.29.0 through 5.3.1: Upgrade to version 5.3.2 or 4.29.1 to resolve the issue. Fastify version 4.9.0: Upgrade to version 4.9.1 to resolve the issue. As a workaround for all affected versions, avoid specifying individual content types in the schema.

Exploit

Fix

Weakness Enumeration

CWE-1287

Related Identifiers

CVE-2025-32442

GHSA-247C-9743-5963

GHSA-MG2H-6X62-WPWC

Affected Products

Fastify

References · 25

• 🔥 https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/32xxx/CVE-2025-32442.json · Exploit
• https://github.com/fastify/fastify/commit/f3d2bcb3963cd570a582e5d39aab01a9ae692fe4 · Patch
• https://github.com/fastify/fastify/commit/436da4c06dfbbb8c24adee3a64de0c51e4f47418 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-32442 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33806 · Security Note
• https://osv.dev/vulnerability/GHSA-mg2h-6x62-wpwc · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-32442 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-247c-9743-5963 · Vendor Advisory
• https://github.com/fastify/fastify · Note
• https://github.com/fastify/fastify/security/advisories/GHSA-247c-9743-5963 · Note
• https://github.com/fastify/fastify/releases/tag/v5.8.5 · Note
• https://t.me/cvedetector/23312 · Telegram Post
• https://cna.openjsf.org/security-advisories.html · Note
• https://twitter.com/CVEnew/status/1913312930072023456 · Twitter Post