CVE-2026-25223Fastify is a fast and low overhead web framework, for Node.js.
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Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type. This issue has been patched in version 5.7.2.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-436, CWE-179
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
fastify fastify fastify:fastify | before 5.7.2 | NVD |
References
- https://fastify.dev/docs/latest/Reference/Validation-and-Serializationproduct, technical-description
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125product
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272product
- https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821patch
- https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmqmitigation, vendor-advisory
- https://hackerone.com/reports/3464114permissions-required
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:5807
- https://access.redhat.com/errata/RHSA-2026:6192
- https://access.redhat.com/security/cve/CVE-2026-25223
- https://bugzilla.redhat.com/show_bug.cgi?id=2436560
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.