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CVE-2026-5038— multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads

Quick assessment

Affected
multer multer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

expressjs Multer是expressjs组织开源的一个用于Node.js中间件。 expressjs Multer存在资源管理错误漏洞，该漏洞源于Readable.pipe()调用未将流销毁信号传播到底层fs.WriteStream，可能导致磁盘空间被耗尽。

CVSS 5.3 · Medium EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
multer multer 2.0.0-alpha.1< 2.2.0 affected
2.2.0 unaffected
3.0.0-alpha.1< 3.0.0-alpha.2 affected
3.0.0-alpha.2 unaffected
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I. Basic Information for CVE-2026-5038

Vulnerability Information
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Vulnerability Title
multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
清理环节不完整
Source: CVE Program / CVE List V5
Vulnerability Title
expressjs Multer 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
expressjs Multer是expressjs组织开源的一个用于Node.js中间件。 expressjs Multer存在资源管理错误漏洞，该漏洞源于Readable.pipe()调用未将流销毁信号传播到底层fs.WriteStream，可能导致磁盘空间被耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
multer multer 2.0.0-alpha.1 ~ 2.2.0 -

II. Public POCs for CVE-2026-5038

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III. Intelligence Information for CVE-2026-5038

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Vendor Advisories for CVE-2026-5038 (1)

IV. Related Vulnerabilities

Same product: multer
Same vendor: multer
Same weakness: CWE-459

V. Comments for CVE-2026-5038

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