npm/fastify CVE-2026-25223: high 7.5, EPSS 0.88%

Fastify's Content-Type header tab character allows body validation bypass

Action: Upgrade fastify to 5.7.2 or later.

npm i fastify@5.7.2

Affected

Fixed versions

Sources

• osv: GHSA-jx2c-rxcm-jvmq
• https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
• https://nvd.nist.gov/vuln/detail/CVE-2026-25223
• https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821
• https://hackerone.com/reports/3464114
• https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
• https://github.com/fastify/fastify
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272

CVE-2026-25223 · published 2026-02-02T22:23:29Z · modified 2026-02-04T18:07:32.787861Z · JSON