CVE Explorer
CVE-2026-5079
Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.
Patches: Users should upgrade to multer 2.2.0 (2.x line) o
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","packageURL":"pkg:npm/multer","product":"multer","vendor":"multer","versions":[{"lessThan":"2.2.0","status":"affected","version":"1.0.0","versionType":"semver"},{"status":"unaffected","version":"2.2.0","versionType":"semver"},{"lessThan":"3.0.0-alpha.2","status":"affected","version":"3.0.0-alpha.1","versionType":"semver"},{"status":"unaffected","version":"3.0.0-alpha.2","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:8a77c9ae177d21a99c46a55fa869b95d913df0e76f09205a31adcb8778feb2bf · sha256:cff338a43668c00d… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:8a77c9ae177d21a99c46a55fa869b95d913df0e76f09205a31adcb8778feb2bf · sha256:cff338a43668c00d… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:8a77c9ae177d21a99c46a55fa869b95d913df0e76f09205a31adcb8778feb2bf · sha256:cff338a43668c00d… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"url":"https://cna.openjsf.org/security-advisories.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8a77c9ae177d21a99c46a55fa869b95d913df0e76f09205a31adcb8778feb2bf · sha256:cff338a43668c00d… · /containers/cna/references/1
{"url":"https://github.com/expressjs/multer/security/advisories/GHSA-72gw-mp4g-v24j"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8a77c9ae177d21a99c46a55fa869b95d913df0e76f09205a31adcb8778feb2bf · sha256:cff338a43668c00d… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.