VDB
CVE-2026-25223
CVE-2026-25223
PUBLISHED
CVSS 7.5 HIGH
Fastify's Content-Type header tab character allows body validation bypass
EPSS 0.02% · 6.3th percentile
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score
0.02%
6.3th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| npm | fastify | 0, 0 |
| fastify | fastify | < 5.7.2, 0, 0 |
Exploit Intelligence
- CIRCL seen: CVE-2026-25223 (circl-sighting)
- https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq (circl)
- https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821 (circl)
- https://fastify.dev/docs/latest/Reference/Validation-and-Serialization (circl)
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125 (circl)
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272 (circl)
- https://hackerone.com/reports/3464114 (osv)
- build-server.ts (github-poc)
- build-server.ts (github-poc)
- build-server.ts (github-poc)
…and 9 more exploits
Timeline
- Feb 2, 2026 CVE Published
- Feb 3, 2026 PoC Published
- Feb 4, 2026 CVE Updated
- Feb 4, 2026 EPSS Score
- Feb 5, 2026 Security Advisory
- Feb 6, 2026 EPSS Score
- Feb 8, 2026 EPSS Score
- Feb 11, 2026 EPSS Score
- Feb 13, 2026 EPSS Score
- Feb 15, 2026 EPSS Score
- Feb 17, 2026 EPSS Score
- Feb 20, 2026 EPSS Score
References
- https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq url
- https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821 url
- https://hackerone.com/reports/3464114 url
- https://fastify.dev/docs/latest/Reference/Validation-and-Serialization url
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125 url
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-25223 advisory
- https://github.com/fastify/fastify package