GHSA-3p4h-7m6x-2hcm

ghsaUSosv

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

view advisory published 2026-06-17Licence: CC-BY-4.0

### 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

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-5038US	high7.5	0.37% (30th)	—	2026-06-15
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 orp…

references

External citations — patches, advisories, analysis.

https://cna.openjsf.org/security-advisories.htmlWEB
https://github.com/expressjs/multerPACKAGE
https://github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcmWEB
https://nvd.nist.gov/vuln/detail/CVE-2026-5038ADVISORY

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