Multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads

CAO 7.5CVE-2026-5038 · GHSA-3p4h-7m6x-2hcm · Công bố 15/06/2026 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2026-5038 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng multer (expressjs), multer.
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.37%, cao hơn 30.6% các lỗ hổng khác.
Cách xử lý: cập nhật lên 2.2.0, 3.0.0-alpha.2 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
multer expressjs	`= 3.0.0≥ 2.0.0, < 2.2.0`	`2.2.0`
multer npm	`≥ 2.0.0-alpha.1, < 2.2.0≥ 3.0.0-alpha.1, < 3.0.0-alpha.2`	`2.2.03.0.0-alpha.2`

Mô tả

Impact

A vulnerability in Multer allows an attacker to trigger a Denial of Service (DoS) by aborting or sending malformed multipart uploads, causing orphaned partial files to accumulate on disk when using diskStorage.

Patches

Users should upgrade to 2.2.0, 3.0.0-alpha.2 or higher

Workarounds

None

Mô tả của NVD

Impact: multer versions 2.0.0-alpha.1 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service when using diskStorage. Aborted or malformed multipart uploads leave orphaned partial files on disk because the Readable.pipe() call does not propagate the stream destroy signal to the underlying fs.WriteStream. An attacker can exhaust disk space by triggering many aborted uploads, with no application bug required. Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease). Both versions track in-flight write streams and clean them up on the abort path. Workarounds: None.