CVE-2026-46551
NocoDB: Missing File Size Enforcement in Upload-by-URL Allows Denial of Service via Disk Exhaustion
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](https://github.com/ik0z).
How to fix CVE-2026-46551
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- —no fix listed
Is CVE-2026-46551 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-46551.
Affected packages (1)
- from 0, <= 0.301.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |