CVE-2026-46551
Received Received - Intake
Denial of Service in NocoDB via Unrestricted File Download

Publication date: 2026-06-23

Last updated on: 2026-06-23

Assigner: GitHub, Inc.

Description
NocoDB is software for building databases as spreadsheets. Prior to 2026.04.4, the uploadViaURL path in the v1/v2 attachment API did not enforce NC_ATTACHMENT_FIELD_SIZE against the remote content-length or against the response stream. An authenticated user (Editor+) could direct the server to download arbitrarily large files, exhausting disk space and causing denial of service. In packages/nocodb/src/services/attachments.service.ts, the HEAD probe read content-length but never compared it to NC_ATTACHMENT_FIELD_SIZE; the subsequent storageAdapter.fileCreateByUrl() performed the download without maxContentLength. This vulnerability is fixed in 2026.04.4.
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Meta Information
Published
2026-06-23
Last Modified
2026-06-23
Generated
2026-06-24
AI Q&A
2026-06-24
EPSS Evaluated
N/A
NVD
CVE-2026-46551
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
nocodb nocodb to 2026.04.4 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
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Executive Summary

This vulnerability exists in NocoDB software versions prior to 2026.04.4, specifically in the uploadViaURL path of the v1/v2 attachment API. An authenticated user with Editor or higher privileges could exploit the lack of enforcement of the NC_ATTACHMENT_FIELD_SIZE limit on remote content-length or the response stream. Essentially, the system did not properly check the size of files being downloaded via URL before storing them, allowing an attacker to cause the server to download arbitrarily large files.

Because the size check was missing, the server could be forced to consume excessive disk space, leading to exhaustion of storage resources and causing a denial of service condition.

This issue was fixed in version 2026.04.4 by properly enforcing the maximum allowed content length before downloading and storing files.

Impact Analysis

The primary impact of this vulnerability is a denial of service (DoS) condition. An attacker with Editor or higher privileges can cause the server to download very large files, exhausting disk space.

This exhaustion of disk space can disrupt normal operations of the NocoDB server, potentially causing it to crash or become unresponsive, thereby affecting availability.

There is no direct impact on confidentiality or integrity according to the CVSS score, but availability is severely affected.

Mitigation Strategies

To mitigate this vulnerability, upgrade NocoDB to version 2026.04.4 or later, where the issue with uploadViaURL path enforcing NC_ATTACHMENT_FIELD_SIZE has been fixed.

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