In short
- CVE-2026-46551 is a MEDIUM (CVSS 6.5) vulnerability affecting nocodb.
- Chance of exploitation in the next 30 days (EPSS): 0.41%, higher than 35.4% of all vulnerabilities.
- No patched version is listed yet: follow the vendor's advisory in References.
| Package | Affected versions | Patched versions |
|---|
| nocodb npm | ≤ 0.301.3
| No fix yet |
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.
NVD 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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