Vulnerability-Lookup

CVE-2026-25223 (GCVE-0-2026-25223)

Vulnerability from cvelistv5 – Published: 2026-02-03 21:21 – Updated: 2026-07-15 01:16

Title

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

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-04 21:18 UTC

CWE

CWE-436 - Interpretation Conflict
CWE-179 - Incorrect Behavior Order: Early Validation

Assigner

GitHub_M mitre root

References

12 references

URL	Tags
https://github.com/fastify/fastify/security/advis…	x_refsource_CONFIRM
https://github.com/fastify/fastify/commit/32d7b6a…	x_refsource_MISC
https://hackerone.com/reports/3464114	x_refsource_MISC
https://fastify.dev/docs/latest/Reference/Validat…	x_refsource_MISC
https://github.com/fastify/fastify/blob/759e9787b…	x_refsource_MISC
https://github.com/fastify/fastify/blob/759e9787b…	x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-25223	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2436560	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:5807	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10184	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6192	vendor-advisoryx_refsource_REDHAT

Impacted products

7 products

Vendor	Product	Version	CPE status
fastify	fastify	Affected: < 5.7.2	guessed
Red Hat	Red Hat OpenShift AI 2.16	Unaffected: 1774282136 , < * (rpm) cpe:/a:redhat:openshift_ai:2.16::el8
Red Hat	Red Hat OpenShift AI 2.25	Unaffected: 1776742021 , < * (rpm) cpe:/a:redhat:openshift_ai:2.25::el9
Red Hat	Red Hat OpenShift AI 2.25	Unaffected: 1776742141 , < * (rpm) cpe:/a:redhat:openshift_ai:2.25::el9
Red Hat	Red Hat OpenShift Dev Spaces 3.27	Unaffected: 1774476526 , < * (rpm) cpe:/a:redhat:openshift_devspaces:3.27::el9
Red Hat	Red Hat Enterprise Linux AI (RHEL AI) 3	cpe:/a:redhat:enterprise_linux_ai:3
Red Hat	Red Hat OpenShift AI (RHOAI)	cpe:/a:redhat:openshift_ai

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FKIE_CVE-2026-25223

Vulnerability from fkie_nvd - Published: 2026-02-03 22:16 - Updated: 2026-07-15 02:18

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://fastify.dev/docs/latest/Reference/Validation-and-Serialization	Product, Technical Description
security-advisories@github.com	https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125	Product
security-advisories@github.com	https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272	Product
security-advisories@github.com	https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821	Patch
security-advisories@github.com	https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq	Mitigation, Vendor Advisory
security-advisories@github.com	https://hackerone.com/reports/3464114	Permissions Required
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:10184
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:5807
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:6192
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-25223
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2436560
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json

Impacted products

	Vendor	Product	Version
	fastify	fastify	*

JSON

To clipboard

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      "url": "https://fastify.dev/docs/latest/Reference/Validation-and-Serialization"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Permissions Required"
      ],
      "url": "https://hackerone.com/reports/3464114"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:10184"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:5807"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:6192"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/security/cve/CVE-2026-25223"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436560"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-436"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-179"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

GHSA-JX2C-RXCM-JVMQ

Vulnerability from github – Published: 2026-02-02 22:23 – Updated: 2026-02-04 17:46

Summary

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

Details

Impact

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.

For example, a request with Content-Type: application/json\ta will bypass JSON schema validation but still be parsed as JSON.

This vulnerability affects all Fastify users who rely on Content-Type-based body validation schemas to enforce data integrity or security constraints. The concrete impact depends on the handler implementation and the level of trust placed in the validated request body, but at the library level, this allows complete bypass of body validation for any handler using Content-Type-discriminated schemas.

This issue is a regression or missed edge case from the fix for a previously reported vulnerability.

Patches

This vulnerability has been patched in Fastify v5.7.2. All users should upgrade to this version or later immediately.

Workarounds

If upgrading is not immediately possible, user can implement a custom onRequest hook to reject requests containing tab characters in the Content-Type header:

fastify.addHook('onRequest', async (request, reply) => {
  const contentType = request.headers['content-type']
  if (contentType && contentType.includes('\t')) {
    reply.code(400).send({ error: 'Invalid Content-Type header' })
  }
})

Resources

https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272
https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125
Fastify Validation and Serialization Documentation
https://hackerone.com/reports/3464114

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Show details on source website

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "fastify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.7.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25223"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-436"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-02T22:23:29Z",
    "nvd_published_at": "2026-02-03T22:16:31Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA 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.\n\nFor example, a request with `Content-Type: application/json\\ta` will bypass JSON schema validation but still be parsed as JSON.\n\nThis vulnerability affects all Fastify users who rely on Content-Type-based body validation schemas to enforce data integrity or security constraints. The concrete impact depends on the handler implementation and the level of trust placed in the validated request body, but at the library level, this allows complete bypass of body validation for any handler using Content-Type-discriminated schemas.\n\nThis issue is a regression or missed edge case from the fix for a previously reported vulnerability.\n\n### Patches\n\nThis vulnerability has been patched in **Fastify v5.7.2**. All users should upgrade to this version or later immediately.\n\n### Workarounds\n\nIf upgrading is not immediately possible, user can implement a custom `onRequest` hook to reject requests containing tab characters in the Content-Type header:\n\n```javascript\nfastify.addHook(\u0027onRequest\u0027, async (request, reply) =\u003e {\n  const contentType = request.headers[\u0027content-type\u0027]\n  if (contentType \u0026\u0026 contentType.includes(\u0027\\t\u0027)) {\n    reply.code(400).send({ error: \u0027Invalid Content-Type header\u0027 })\n  }\n})\n```\n\n### Resources\n\n- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272\n- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125\n- [Fastify Validation and Serialization Documentation](https://fastify.dev/docs/latest/Reference/Validation-and-Serialization/)\n- https://hackerone.com/reports/3464114",
  "id": "GHSA-jx2c-rxcm-jvmq",
  "modified": "2026-02-04T17:46:02Z",
  "published": "2026-02-02T22:23:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25223"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3464114"
    },
    {
      "type": "WEB",
      "url": "https://fastify.dev/docs/latest/Reference/Validation-and-Serialization"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fastify/fastify"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fastify\u0027s Content-Type header tab character allows body validation bypass"
}

RHSA-2026:10184

Vulnerability from csaf_redhat - Published: 2026-04-23 14:53 - Updated: 2026-09-14 13:35

Summary

Red Hat Security Advisory: RHOAI 2.25.5 - Red Hat OpenShift AI

Severity

Important

Scope

50 vulnerabilities in this advisory, including CVE-2026-25223.

CVE-2026-25223

A flaw was found in Fastify, a web framework for Node.js. A remote attacker can exploit a validation bypass vulnerability by appending a tab character followed by arbitrary content to the Content-Type header. This circumvents the request body validation schemas, allowing the server to process the body as the original content type without proper validation. This could lead to unexpected data processing and potential integrity impact.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Fixed: 8 products Known not affected: 200 products

https://access.redhat.com/errata/RHSA-2026:10184

Open the full advisory

RHSA-2026:5807

Vulnerability from csaf_redhat - Published: 2026-03-25 12:32 - Updated: 2026-09-14 12:20

Summary

Red Hat Security Advisory: RHOAI 2.16.4 - Red Hat OpenShift AI

Severity

Important

Scope

19 vulnerabilities in this advisory, including CVE-2026-25223.

CVE-2026-25223

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Fixed: 1 product Known not affected: 26 products

https://access.redhat.com/errata/RHSA-2026:5807

Open the full advisory

RHSA-2026:6192

Vulnerability from csaf_redhat - Published: 2026-03-30 15:41 - Updated: 2026-09-14 12:20

Summary

Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.27.0 Release.

Severity

Important

Scope

19 vulnerabilities in this advisory, including CVE-2026-25223.

CVE-2026-25223

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Fixed: 4 products Known not affected: 57 products

https://access.redhat.com/errata/RHSA-2026:6192

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-25223 (GCVE-0-2026-25223)

FKIE_CVE-2026-25223

GHSA-JX2C-RXCM-JVMQ

Impact

Patches

Workarounds

Resources

RHSA-2026:10184

RHSA-2026:5807

RHSA-2026:6192

Tags

Sightings

Nomenclature