How severe is CVE-2026-5038?

CVE-2026-5038 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-5038 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5038?

CVE-2026-5038 primarily affects Expressjs Multer. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-5038?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5038 have an EU (EUVD) identifier?

Yes. CVE-2026-5038 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36728.

When was CVE-2026-5038 published?

CVE-2026-5038 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-5038

CVE-2026-5038 is a medium-severity vulnerability in Expressjs Multer with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-459.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36728
Weakness: CWE-459
Affected product: Expressjs Multer
Published: 2026-06-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-5038?: 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.
How severe is CVE-2026-5038?: CVE-2026-5038 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-5038 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5038?: CVE-2026-5038 primarily affects Expressjs Multer. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-5038?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5038 have an EU (EUVD) identifier?: Yes. CVE-2026-5038 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36728.
When was CVE-2026-5038 published?: CVE-2026-5038 was published on 2026-06-15 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*
cpe:2.3:a:expressjs:multer:3.0.0:alpha1:*:*:*:node.js:*:*

More vulnerabilities in Expressjs Multer

CVE-2026-5079 — High (CVSS 7.5): 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…
CVE-2026-3520 — High (CVSS 7.5): Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1…
CVE-2026-3304 — High (CVSS 7.5): Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0…
CVE-2026-2359 — High (CVSS 7.5): Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0…

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