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    CVE-2026-25223

    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.

    Published:Feb 3, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 3, 2026
    EPSS Score:0.0002
    CVSS Score:7.5

    Affected Products

    Vendor
    Fastify
    Product
    Fastify

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-84428 (CVSS 7.5) — fastify versions before 5.12.2 implement the case-insensitive nature of HTTP header names by lowercasing names…
    CVE-2026-84469 (CVSS 7.5) — fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but …
    CVE-2026-76169 (CVSS 7.5) — fastify versions >= 4.0.0 and before 5.12.2 can route a malformed URL sent under one plugin prefix to the cust…
    CVE-2026-84504 (CVSS 8.1) — fastify versions before 5.12.2 treat the object resolved by a successful Ajv async validator as the value resu…
    CVE-2026-16732 (CVSS 6.1) — fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard …
    CVE-2026-18504 (CVSS 5.4) — fastify is a fast and low overhead web framework for Node.js. Versions of fastify before 5.12.1 are affected b…
    CVE-2026-33806 (CVSS 7.5) — Impact: Fastify applications using schema.body.content for per-content-type body validation can have validati…
    CVE-2026-3635 (CVSS 6.1) — Summary When trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: …
    CVE-2026-3419 (CVSS 5.3) — Fastify incorrectly accepts malformed `Content-Type` headers containing trailing characters after the subtype …
    CVE-2026-25224 (CVSS 3.7) — Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.3, a denial-of-service vul…

    References

    https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
    https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125
    https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272
    https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821
    https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
    https://hackerone.com/reports/3464114
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High