GHSA-99vc-2jx2-688p — medium GitHub Advisory (CVE-2026-46551) in npm/nocodb

Description

Summary

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.

Details

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. The v3 service (v3/data-attachment-v3.service.ts) already enforced the limit, but the v1/v2 endpoints (POST /api/v1/db/storage/upload-by-url, POST /api/v2/storage/upload-by-url) did not.

This is distinct from GHSA-xr7v-j379-34v9 (blind SSRF via HEAD) — same code area, different class.

Impact

Authenticated DoS via disk exhaustion. Editor role suffices.
Cascading failures once disk fills: blocked DB writes, log rotation, application crash.

Credit

This issue was reported by @ik0z.

Basic information

Type: reviewed
Severity: medium
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-05-21 20:35:41 UTC
Updated: 2026-05-21 20:35:42 UTC
GitHub reviewed: 2026-05-21 20:35:41 UTC

CVSS Scores

Base score	Version	Severity	Vector
6.5	3.1	—	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type	Value
GHSA	GHSA-99vc-2jx2-688p ↗
CVE	CVE-2026-46551 ↗

CWEs

CWE id	Name
CWE-770	Allocation of Resources Without Limits or Throttling

Credits

ik0z (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
npm	nocodb	<= 0.301.3	—	—

NocoDB: Missing File Size Enforcement in Upload-by-URL Allows Denial of Service via Disk Exhaustion