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Response snapshot Oct 31, 2026, 00:16 UTC

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VulnerabilityCVE-2026-63184

Refitter is a tool for generating a C# REST API client using the Refit library.

Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.1, the refitter dotnet tool invokes NJsonSchema with unsafe defaults for $ref resolution when generating Refit interfaces and contracts from attacker-controlled or attacker-influenced OpenAPI descriptions.

At a glance

Exploited
Not known
Severity
7.1 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-63184 (opens a new tab)

What happened

Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.1, the refitter dotnet tool invokes NJsonSchema with unsafe defaults for $ref resolution when generating Refit interfaces and contracts from attacker-controlled or attacker-influenced OpenAPI descriptions.

Remote http(s) references cause requests from the developer or CI host and inline untrusted remote schema content into generated output. Absolute local file paths and relative ../ traversal outside the input directory also resolve and inline local content, permitting arbitrary local-file disclosure.

The demonstrated chain stops at server-side request forgery, remote file inclusion, and local file inclusion, not code execution: Refit sets the base URL at runtime, enum values use verbatim-string doubling, and string defaults are escaped. This issue is fixed in version 2.1.1.

Scores and how they were measured

CVSS base severity

7.1

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-63184 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 30). Refitter is a tool for generating a C# REST API client using the Refit library. (CVE-2026-63184). https://kevwire.com/record/CVE-2026-63184

MLA

"Refitter is a tool for generating a C# REST API client using the Refit library. (CVE-2026-63184)." KEVWire, 30 Oct. 2026, kevwire.com/record/CVE-2026-63184.

Chicago

KEVWire. "Refitter is a tool for generating a C# REST API client using the Refit library. (CVE-2026-63184)." Last modified October 30, 2026. https://kevwire.com/record/CVE-2026-63184.

Evidence summary (plain text)

Refitter is a tool for generating a C# REST API client using the Refit library. (Oct 30, 2026).
Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.1, the refitter dotnet tool invokes NJsonSchema with unsafe defaults for $ref resolution when generating Refit interfaces and contracts from attacker-controlled or attacker-influenced OpenAPI descriptions. Remote http(s) references cause requests from the developer or CI host and inline untrusted remote schema content into generated output. Absolute local file paths and relative ../ traversal outside the input directory also resolve and inline local content, permitting arbitrary local-file disclosure.
CVSS 7.1 (version 3.1; evidence as of Oct 30, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-63184).
Sources:
NVD CVE-2026-63184: https://nvd.nist.gov/vuln/detail/CVE-2026-63184
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T22:05:59.313Z&lastModEndDate=2026-10-30T23:40:58.124Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T21:30:58.248Z&lastModEndDate=2026-10-30T23:05:57.023Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T20:56:01.746Z&lastModEndDate=2026-10-30T22:30:56.395Z&resultsPerPage=500&startIndex=0
Record ID: CVE-2026-63184.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 30, 2026, 23:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Received. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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