SecuriTricks - CVE-2026-5038

Description

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.

Product(s) Impacted

Vendor	Product	Versions
Expressjs	Multer	*, 3.0.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-459

Incomplete Cleanup

The product does not properly "clean up" and remove temporary or supporting resources after they have been used.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	expressjs	multer	/	/	/	/	/	node.js	/	/
a	expressjs	multer	3.0.0	alpha1	/	/	/	node.js	/	/

References

https://cna.openjsf.org/security-advisories.html

https://github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcm

CVSS Score

5.3 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

View Vector String

Timeline

Published: June 15, 2026, 4:16 p.m.
Last Modified: June 16, 2026, 4:59 p.m.

Status : Analyzed

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

ce714d77-add3-4f53-aff5-83d477b104bb

CVE-2026-5038