Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 0.75% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2025
CVE-2025-7338High confidence
Multer vulnerable to Denial of Service via unhandled exception from malformed request
expressjs · multer
Official source article: GitHub GHSA-FJGF-RC76-4X9P ↗. Check the applicable product and release in the original source.
7.5HighCVSS 3.1
Within 7 days
Patch availableHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:High, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs expressjs multer and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Open-source package ranges1 source-attributed range
These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.
| Ecosystem and package | Affected range | First fixed version | Evidence |
|---|---|---|---|
| npmmulter | >= 1.4.4-lts.1, < 2.0.2 | 2.0.2 | GitHub advisory ↗upstream repository advisory · 17 Jul 2025 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2025-7338 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitymulter: Multer Denial of Service
The vendor explicitly identifies these products as affected by this CVE.
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless
- Summary
- A denial of service vulnerability was found in the Multer NPM library. This vulnerability allows an attacker to trigger a denial of service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, resulting in a process crash.
- Remediation
- For more about Red Hat Developer Hub, see References links
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch available01
What, why and how
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.2 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.2 to receive a patch. No known workarounds are available.
What
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.2 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.2 to receive a patch. No known workarounds are available.
Why
An exception is thrown from a function, but it is not caught.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
What
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.2 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.2 to receive a patch. No known workarounds are available.
Why
An exception is thrown from a function, but it is not caught.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Uncaught Exception → disrupt the affected service
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-248 ↗
CWE-248: Uncaught Exception. An exception is thrown from a function, but it is not caught.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Affected
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless
- Fixed
- registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:48b72d96926999336505cbf097f873dd9ccb2dec814a5db7f7ffa630dea29dc5_amd64 as a component of Red Hat Developer Hub 1.6
- registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:aa3c5b50c65aee51b932fafcbf479ce54f15496cffc2744860bd9e135cce815c_amd64 as a component of Red Hat Developer Hub 1.7
- Action
- For more about Red Hat Developer Hub, see References links
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 17 Jul 2025 · Last source change 17 Jul 2025, 16:48 UTC · CWE-248 · Uncaught Exception
CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2025-21776
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD not scheduled
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- 1.4.4-lts.1 < 2.0.2 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- 1.4.4-lts.1 < 2.0.2 · Fixed: For more about Red Hat Developer Hub, see References links
- Remediation statusRemediation status changed from Awaiting fix to Patch available.Red Hat Product Security ↗
- Before
- Awaiting fix
- After
- Patch available
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless · Fixed: registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:48b72d96926999336505cbf097f873dd9ccb2dec814a5db7f7ffa630dea29dc5_amd64 as a component of Red Hat Developer Hub (RHDH) 1.6; registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:aa3c5b50c65aee51b932fafcbf479ce54f15496cffc2744860bd9e135cce815c_amd64 as a component of Red Hat Developer Hub 1.7
- After
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless · Fixed: registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:48b72d96926999336505cbf097f873dd9ccb2dec814a5db7f7ffa630dea29dc5_amd64 as a component of Red Hat Developer Hub 1.6; registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:aa3c5b50c65aee51b932fafcbf479ce54f15496cffc2744860bd9e135cce815c_amd64 as a component of Red Hat Developer Hub 1.7
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless · Fixed: registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:48b72d96926999336505cbf097f873dd9ccb2dec814a5db7f7ffa630dea29dc5_amd64 as a component of Red Hat Developer Hub 1.6; registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:aa3c5b50c65aee51b932fafcbf479ce54f15496cffc2744860bd9e135cce815c_amd64 as a component of Red Hat Developer Hub 1.7
- After
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless · Fixed: registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:48b72d96926999336505cbf097f873dd9ccb2dec814a5db7f7ffa630dea29dc5_amd64 as a component of Red Hat Developer Hub (RHDH) 1.6; registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:aa3c5b50c65aee51b932fafcbf479ce54f15496cffc2744860bd9e135cce815c_amd64 as a component of Red Hat Developer Hub 1.7
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless · Fixed: registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:48b72d96926999336505cbf097f873dd9ccb2dec814a5db7f7ffa630dea29dc5_amd64 as a component of Red Hat Developer Hub (RHDH) 1.6; registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:aa3c5b50c65aee51b932fafcbf479ce54f15496cffc2744860bd9e135cce815c_amd64 as a component of Red Hat Developer Hub 1.7
- After
- openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 as a component of OpenShift Serverless · Fixed: registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:48b72d96926999336505cbf097f873dd9ccb2dec814a5db7f7ffa630dea29dc5_amd64 as a component of Red Hat Developer Hub 1.6; registry.redhat.io/rhdh/rhdh-hub-rhel9@sha256:aa3c5b50c65aee51b932fafcbf479ce54f15496cffc2744860bd9e135cce815c_amd64 as a component of Red Hat Developer Hub 1.7
CVE published
Fixed release recorded from official guidance
Fixed release recorded from official guidance
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.