How severe is GHSA-3pph-fpjx-jg34?

GHSA-3pph-fpjx-jg34 has a CVSS score of 5.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-3pph-fpjx-jg34?

GHSA-3pph-fpjx-jg34 affects the following packages: multer (npm). Ecosystems affected: npm.

How do I fix GHSA-3pph-fpjx-jg34?

Update multer to 2.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3pph-fpjx-jg34 is resolved across your whole dependency graph.

How do I detect GHSA-3pph-fpjx-jg34 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for multer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-3pph-fpjx-jg34 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is GHSA-3pph-fpjx-jg34 actively exploited in the wild?

No public exploit code has been indexed for GHSA-3pph-fpjx-jg34 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-3pph-fpjx-jg34?

GHSA-3pph-fpjx-jg34 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 44th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-3pph-fpjx-jg34?

GHSA-3pph-fpjx-jg34 is classified as Uncontrolled Resource Consumption (CWE-400), CWE-459 (CWE-459). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-3pph-fpjx-jg34 published, and has it been updated?

GHSA-3pph-fpjx-jg34 was published on September 28, 2026 and was last updated on September 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 npm

Not in CISA KEV

MEDIUM severity

multer vulnerable to Denial of Service via orphaned disk writes on aborted uploadsGHSA-3pph-fpjx-jg34

MEDIUMFix: expressjs/multer@53337f9

GHSA-3pph-fpjx-jg34 is a medium-severity (CVSS 5.3) Uncontrolled Resource Consumption vulnerability in multer. A fix is available for multer — see the affected versions and patch details below.

Also known asCVE-2026-88932

Published

Sep 28, 2026

Updated

Sep 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 24, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-3pph-fpjx-jg34.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-3pph-fpjx-jg34 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

7Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

multernpm

14.4Mdownloads / week

Description

Impact

Multer's diskStorage can leave complete, orphaned files on disk when a multipart upload is aborted in the brief window before the storage engine assigns the file path. This is an incomplete fix of CVE-2026-5038: the earlier cleanup removes only in-flight uploads that already have a path, so an upload aborted inside that window is written to disk with nothing left to remove it, and the application is not given a handle to clean it up. An unauthenticated attacker sending aborted requests to any route backed by disk storage can accumulate orphaned files until the upload directory or the shared system temporary directory is exhausted. An asynchronous destination or filename widens the window.

Patches

Users should upgrade to 2.4.0 or higher.

Workarounds

None.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`multer`	≥ 2.2.0&&< 2.4.0	2.4.0`npm install multer@2.4.0`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for multer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update multer to 2.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3pph-fpjx-jg34 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

This Moderate flaw in `multer` can lead to a denial of service in Red Hat products that process multipart/form-data uploads. A remote unauthenticated attacker can repeatedly initiate and abort uploads, causing orphaned files to accumulate and exhaust available disk space. This risk is present in deployments where…

Workaround published by Red Hat

Until updates are available, administrators can implement the following mitigations to reduce the risk of disk exhaustion: 1. Monitor disk usage on systems running Red Hat Developer Hub or Ansible Portal and set up alerts for unusual disk consumption patterns. 2. Implement rate limiting on file upload endpoints to restrict the number of upload requests from a single IP address or user account within a given time period. 3. If authentication is not strictly required for file upload endpoints, enable authentication to reduce the attack surface to authenticated users only. 4. Periodically clean up orphaned temporary files in multer's storage directory. The default upload directory is typically…

Source: Red Hat security advisory for GHSA-3pph-fpjx-jg34 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat Ansible Automation Platform 2.1	`ansible-automation-platform/automation-portal:1790254963`	RHSA-2026:72712
Red Hat Ansible Automation Platform 2.2	`ansible-automation-platform/automation-portal:1790256405`	RHSA-2026:72722
Red Hat Ansible Automation Platform 2.2	`ansible-automation-platform/bootc-automation-portal-rhel9:1791865660`	RHSA-2026:82151
Red Hat Developer Hub 1.10	`rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend:1791242697`	RHSA-2026:76788
Red Hat Developer Hub 1.10	`rhdh/rhdh-hub-rhel9:1791311495`	RHSA-2026:79088

Frequently Asked Questions

### Impact Multer's `diskStorage` can leave complete, orphaned files on disk when a multipart upload is aborted in the brief window before the storage engine assigns the file path. This is an incomplete fix of CVE-2026-5038: the earlier cleanup removes only in-flight uploads that already have a path, so an upload aborted inside that window is written to disk with nothing left to remove it, and the application is not given a handle to clean it up. An unauthenticated attacker sending aborted requests to any route backed by disk storage can accumulate orphaned files until the upload directory or