Multer vulnerable to Denial of Service via incomplete cleanup

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0074, the 54th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 1 Mar 2026. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-xf7r-hgr6-v32p
• OSV: GHSA-xf7r-hgr6-v32p
• github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p
• nvd.nist.gov/vuln/detail/CVE-2026-3304
• github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee
• cna.openjsf.org/security-advisories.html
• github.com/expressjs/multer
• www.cve.org/CVERecord?id=CVE-2026-3304

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.