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26 vulnerabilities found for multer by expressjs
CVE-2026-82333 (GCVE-0-2026-82333)
Vulnerability from nvd – Published: 2026-08-28 20:12 – Updated: 2026-08-31 18:39
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via oversized array index in field names
Summary
multer is a middleware for handling multipart/form-data in Node.js. A small multipart request with two specially crafted text field names can make multer's field parser synchronously iterate a maximum-length sparse array, blocking the event loop so the process cannot handle other requests. A large numeric array index in the first field allocates a maximum-length sparse array, and a second field with a non-numeric key then triggers a full-length iteration inside the append-field dependency. All versions before 2.3.0 are affected, and this is a remotely triggerable denial of service. multer 2.3.0 adds an opt-in fieldArrayIndexLimit option that rejects oversized array indexes. Upgrade to multer 2.3.0 and set limits.fieldArrayIndexLimit to the largest array index your application needs to remediate.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:39 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
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CVE-2026-77078 (GCVE-0-2026-77078)
Vulnerability from nvd – Published: 2026-08-28 20:03 – Updated: 2026-08-31 18:40
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via crafted multipart field names
Summary
multer is a middleware for handling multipart/form-data in Node.js. A small multipart request containing two specially crafted text field names can cause an uncaught RangeError (Invalid array length) that terminates the Node.js process. The first field uses a very large numeric array index to allocate a maximum-length sparse array, and a second field then pushes past that length, which throws inside the append-field dependency and is not caught by multer. All versions before 2.3.0 are affected, and the issue is a remotely triggerable denial of service. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:40 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
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CVE-2026-77063 (GCVE-0-2026-77063)
Vulnerability from nvd – Published: 2026-08-28 19:54 – Updated: 2026-08-31 18:40
VLAI
EPSS
VEX
Title
multer vulnerable to file size limit bypass via async fileFilter race condition
Summary
multer is a middleware for handling multipart/form-data in Node.js. When an application uses an asynchronous fileFilter together with the fileSize limit, a race condition in multer's file stream handling can allow a file that exceeds the configured size limit to bypass the size-limit rejection. All versions before 2.3.0 are affected. The impact is limited because the underlying multipart parser still truncates the stream at the size limit, so this is a bypass of the limit rejection rather than uncontrolled resource consumption. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:40 UTC
CWE
- CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Impacted products
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CVE-2026-77037 (GCVE-0-2026-77037)
Vulnerability from nvd – Published: 2026-08-28 19:44 – Updated: 2026-08-31 18:41
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via file descriptor leak on aborted uploads
Summary
multer is a middleware for handling multipart/form-data in Node.js. In version 2.2.0, when a disk-backed upload is aborted or truncated before the write stream finishes, multer's disk storage engine removes the visible file but does not close the underlying write file descriptor, leaving a deleted but still open descriptor. A remote attacker able to reach an upload route using the built-in disk storage can send repeated aborted or malformed multipart uploads, each one leaking a file descriptor and retaining disk blocks until the process exits, which can exhaust resources and cause a denial of service. The issue is fixed in multer 2.3.0, which closes the destination write stream on abnormal source termination and defers cleanup until the stream has closed. Upgrade to multer 2.3.0 to remediate.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:41 UTC
Assigner
References
Impacted products
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CVE-2026-5038 (GCVE-0-2026-5038)
Vulnerability from nvd – Published: 2026-06-15 14:23 – Updated: 2026-06-15 16:07
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 16:07 UTC
CWE
- CWE-459 - Incomplete Cleanup
Assigner
References
Impacted products
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CVE-2026-5079 (GCVE-0-2026-5079)
Vulnerability from nvd – Published: 2026-06-15 13:56 – Updated: 2026-06-15 16:00
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via deeply nested field names
Summary
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) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.
Workarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 16:00 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
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CVE-2026-3520 (GCVE-0-2026-3520)
Vulnerability from nvd – Published: 2026-03-04 16:17 – Updated: 2026-07-15 01:03
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via uncontrolled recursion
Summary
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-04 17:12 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | |
| https://www.cve.org/CVERecord?id=CVE-2026-3520 | |
| https://github.com/expressjs/multer/commit/7e6648… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-3520 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2444584 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:6174 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:6802 | vendor-advisoryx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| expressjs | multer |
Affected:
0 , < 2.1.1
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|
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
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|
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Unaffected:
1775140647 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Self-service automation portal 2 |
cpe:/a:redhat:ansible_portal:2
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CVE-2026-3304 (GCVE-0-2026-3304)
Vulnerability from nvd – Published: 2026-02-27 15:44 – Updated: 2026-07-15 01:07
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via incomplete cleanup
Summary
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 17:12 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | |
| https://www.cve.org/CVERecord?id=CVE-2026-3304 | |
| https://github.com/expressjs/multer/commit/739919… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-3304 | vdb-entryx_refsource_REDHAT |
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| https://access.redhat.com/errata/RHSA-2026:6802 | vendor-advisoryx_refsource_REDHAT |
Impacted products
11 products
| Vendor | Product | Version | |
|---|---|---|---|
| expressjs | multer |
Affected:
0.0.0 , < 2.1.0
(semver)
|
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
1774545605 , < *
(rpm)
cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
1775140647 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
|
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
cpe:/a:redhat:logging:6 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Trusted Profile Analyzer |
cpe:/a:redhat:trusted_profile_analyzer:2
|
|
| Red Hat | Self-service automation portal 2 |
cpe:/a:redhat:ansible_portal:2
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CVE-2026-2359 (GCVE-0-2026-2359)
Vulnerability from nvd – Published: 2026-02-27 15:42 – Updated: 2026-07-15 01:18
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via resource exhaustion
Summary
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 17:13 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | |
| https://www.cve.org/CVERecord?id=CVE-2026-2359 | |
| https://github.com/expressjs/multer/commit/cccf0f… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-2359 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2443350 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:6174 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:6802 | vendor-advisoryx_refsource_REDHAT |
Impacted products
11 products
| Vendor | Product | Version | |
|---|---|---|---|
| expressjs | multer |
Affected:
0.0.0 , < 2.1.0
(semver)
|
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
1774545605 , < *
(rpm)
cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
1775140647 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
|
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
cpe:/a:redhat:logging:6 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Trusted Profile Analyzer |
cpe:/a:redhat:trusted_profile_analyzer:2
|
|
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cpe:/a:redhat:ansible_portal:2
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CVE-2025-7338 (GCVE-0-2025-7338)
Vulnerability from nvd – Published: 2025-07-17 15:26 – Updated: 2025-07-17 16:48
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via unhandled exception from malformed request
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-07-17 16:48 UTC
CWE
Assigner
References
Impacted products
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CVE-2025-48997 (GCVE-0-2025-48997)
Vulnerability from nvd – Published: 2025-06-03 18:21 – Updated: 2025-06-03 18:30
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via unhandled exception
Summary
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 2.0.1 allows an attacker to trigger a Denial of Service (DoS) by sending an upload file request with an empty string field name. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to `2.0.1` to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-03 18:29 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
4 references
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|---|---|
| https://github.com/expressjs/multer/security/advi… | x_refsource_CONFIRM |
| https://github.com/expressjs/multer/issues/1233 | x_refsource_MISC |
| https://github.com/expressjs/multer/pull/1256 | x_refsource_MISC |
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Impacted products
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CVE-2025-47944 (GCVE-0-2025-47944)
Vulnerability from nvd – Published: 2025-05-19 19:20 – Updated: 2025-05-20 13:13
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service from maliciously crafted requests
Summary
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 2.0.0 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 2.0.0 to receive a patch. No known workarounds are available.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-20 13:13 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
3 references
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| https://github.com/expressjs/multer/issues/1176 | x_refsource_MISC |
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CVE-2025-47935 (GCVE-0-2025-47935)
Vulnerability from nvd – Published: 2025-05-19 19:18 – Updated: 2025-05-27 20:28
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via memory leaks from unclosed streams
Summary
Multer is a node.js middleware for handling `multipart/form-data`. Versions prior to 2.0.0 are vulnerable to a resource exhaustion and memory leak issue due to improper stream handling. When the HTTP request stream emits an error, the internal `busboy` stream is not closed, violating Node.js stream safety guidance. This leads to unclosed streams accumulating over time, consuming memory and file descriptors. Under sustained or repeated failure conditions, this can result in denial of service, requiring manual server restarts to recover. All users of Multer handling file uploads are potentially impacted. Users should upgrade to 2.0.0 to receive a patch. No known workarounds are available.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-20 14:29 UTC
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
3 references
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|---|---|
| https://github.com/expressjs/multer/security/advi… | x_refsource_CONFIRM |
| https://github.com/expressjs/multer/pull/1120 | x_refsource_MISC |
| https://github.com/expressjs/multer/commit/2c8505… | x_refsource_MISC |
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CVE-2026-82333 (GCVE-0-2026-82333)
Vulnerability from cvelistv5 – Published: 2026-08-28 20:12 – Updated: 2026-08-31 18:39
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via oversized array index in field names
Summary
multer is a middleware for handling multipart/form-data in Node.js. A small multipart request with two specially crafted text field names can make multer's field parser synchronously iterate a maximum-length sparse array, blocking the event loop so the process cannot handle other requests. A large numeric array index in the first field allocates a maximum-length sparse array, and a second field with a non-numeric key then triggers a full-length iteration inside the append-field dependency. All versions before 2.3.0 are affected, and this is a remotely triggerable denial of service. multer 2.3.0 adds an opt-in fieldArrayIndexLimit option that rejects oversized array indexes. Upgrade to multer 2.3.0 and set limits.fieldArrayIndexLimit to the largest array index your application needs to remediate.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:39 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
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CVE-2026-77078 (GCVE-0-2026-77078)
Vulnerability from cvelistv5 – Published: 2026-08-28 20:03 – Updated: 2026-08-31 18:40
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via crafted multipart field names
Summary
multer is a middleware for handling multipart/form-data in Node.js. A small multipart request containing two specially crafted text field names can cause an uncaught RangeError (Invalid array length) that terminates the Node.js process. The first field uses a very large numeric array index to allocate a maximum-length sparse array, and a second field then pushes past that length, which throws inside the append-field dependency and is not caught by multer. All versions before 2.3.0 are affected, and the issue is a remotely triggerable denial of service. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:40 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
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CVE-2026-77063 (GCVE-0-2026-77063)
Vulnerability from cvelistv5 – Published: 2026-08-28 19:54 – Updated: 2026-08-31 18:40
VLAI
EPSS
VEX
Title
multer vulnerable to file size limit bypass via async fileFilter race condition
Summary
multer is a middleware for handling multipart/form-data in Node.js. When an application uses an asynchronous fileFilter together with the fileSize limit, a race condition in multer's file stream handling can allow a file that exceeds the configured size limit to bypass the size-limit rejection. All versions before 2.3.0 are affected. The impact is limited because the underlying multipart parser still truncates the stream at the size limit, so this is a bypass of the limit rejection rather than uncontrolled resource consumption. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:40 UTC
CWE
- CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Impacted products
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CVE-2026-77037 (GCVE-0-2026-77037)
Vulnerability from cvelistv5 – Published: 2026-08-28 19:44 – Updated: 2026-08-31 18:41
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via file descriptor leak on aborted uploads
Summary
multer is a middleware for handling multipart/form-data in Node.js. In version 2.2.0, when a disk-backed upload is aborted or truncated before the write stream finishes, multer's disk storage engine removes the visible file but does not close the underlying write file descriptor, leaving a deleted but still open descriptor. A remote attacker able to reach an upload route using the built-in disk storage can send repeated aborted or malformed multipart uploads, each one leaking a file descriptor and retaining disk blocks until the process exits, which can exhaust resources and cause a denial of service. The issue is fixed in multer 2.3.0, which closes the destination write stream on abnormal source termination and defers cleanup until the stream has closed. Upgrade to multer 2.3.0 to remediate.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:41 UTC
Assigner
References
Impacted products
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CVE-2026-5038 (GCVE-0-2026-5038)
Vulnerability from cvelistv5 – Published: 2026-06-15 14:23 – Updated: 2026-06-15 16:07
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads
Summary
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
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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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 16:07 UTC
CWE
- CWE-459 - Incomplete Cleanup
Assigner
References
Impacted products
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CVE-2026-5079 (GCVE-0-2026-5079)
Vulnerability from cvelistv5 – Published: 2026-06-15 13:56 – Updated: 2026-06-15 16:00
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via deeply nested field names
Summary
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) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.
Workarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 16:00 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
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CVE-2026-3520 (GCVE-0-2026-3520)
Vulnerability from cvelistv5 – Published: 2026-03-04 16:17 – Updated: 2026-07-15 01:03
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via uncontrolled recursion
Summary
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-04 17:12 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | |
| https://www.cve.org/CVERecord?id=CVE-2026-3520 | |
| https://github.com/expressjs/multer/commit/7e6648… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-3520 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2444584 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:6174 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:6802 | vendor-advisoryx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| expressjs | multer |
Affected:
0 , < 2.1.1
(semver)
|
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
1774545605 , < *
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cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
1775140647 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Self-service automation portal 2 |
cpe:/a:redhat:ansible_portal:2
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CVE-2026-3304 (GCVE-0-2026-3304)
Vulnerability from cvelistv5 – Published: 2026-02-27 15:44 – Updated: 2026-07-15 01:07
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via incomplete cleanup
Summary
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 17:12 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | |
| https://www.cve.org/CVERecord?id=CVE-2026-3304 | |
| https://github.com/expressjs/multer/commit/739919… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-3304 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2443353 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:6174 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:6802 | vendor-advisoryx_refsource_REDHAT |
Impacted products
11 products
| Vendor | Product | Version | |
|---|---|---|---|
| expressjs | multer |
Affected:
0.0.0 , < 2.1.0
(semver)
|
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
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cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
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cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
|
|
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|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Trusted Profile Analyzer |
cpe:/a:redhat:trusted_profile_analyzer:2
|
|
| Red Hat | Self-service automation portal 2 |
cpe:/a:redhat:ansible_portal:2
|
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CVE-2026-2359 (GCVE-0-2026-2359)
Vulnerability from cvelistv5 – Published: 2026-02-27 15:42 – Updated: 2026-07-15 01:18
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via resource exhaustion
Summary
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 17:13 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | |
| https://www.cve.org/CVERecord?id=CVE-2026-2359 | |
| https://github.com/expressjs/multer/commit/cccf0f… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-2359 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2443350 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:6174 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:6802 | vendor-advisoryx_refsource_REDHAT |
Impacted products
11 products
| Vendor | Product | Version | |
|---|---|---|---|
| expressjs | multer |
Affected:
0.0.0 , < 2.1.0
(semver)
|
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
1774545605 , < *
(rpm)
cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
1775140647 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
|
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
cpe:/a:redhat:logging:6 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Trusted Profile Analyzer |
cpe:/a:redhat:trusted_profile_analyzer:2
|
|
| Red Hat | Self-service automation portal 2 |
cpe:/a:redhat:ansible_portal:2
|
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CVE-2025-7338 (GCVE-0-2025-7338)
Vulnerability from cvelistv5 – Published: 2025-07-17 15:26 – Updated: 2025-07-17 16:48
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via unhandled exception from malformed request
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-07-17 16:48 UTC
CWE
Assigner
References
Impacted products
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CVE-2025-48997 (GCVE-0-2025-48997)
Vulnerability from cvelistv5 – Published: 2025-06-03 18:21 – Updated: 2025-06-03 18:30
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via unhandled exception
Summary
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 2.0.1 allows an attacker to trigger a Denial of Service (DoS) by sending an upload file request with an empty string field name. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to `2.0.1` to receive a patch. No known workarounds are available.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-03 18:29 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | x_refsource_CONFIRM |
| https://github.com/expressjs/multer/issues/1233 | x_refsource_MISC |
| https://github.com/expressjs/multer/pull/1256 | x_refsource_MISC |
| https://github.com/expressjs/multer/commit/35a327… | x_refsource_MISC |
Impacted products
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CVE-2025-47944 (GCVE-0-2025-47944)
Vulnerability from cvelistv5 – Published: 2025-05-19 19:20 – Updated: 2025-05-20 13:13
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service from maliciously crafted requests
Summary
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 2.0.0 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 2.0.0 to receive a patch. No known workarounds are available.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-20 13:13 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | x_refsource_CONFIRM |
| https://github.com/expressjs/multer/issues/1176 | x_refsource_MISC |
| https://github.com/expressjs/multer/commit/2c8505… | x_refsource_MISC |
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CVE-2025-47935 (GCVE-0-2025-47935)
Vulnerability from cvelistv5 – Published: 2025-05-19 19:18 – Updated: 2025-05-27 20:28
VLAI
EPSS
VEX
Title
Multer vulnerable to Denial of Service via memory leaks from unclosed streams
Summary
Multer is a node.js middleware for handling `multipart/form-data`. Versions prior to 2.0.0 are vulnerable to a resource exhaustion and memory leak issue due to improper stream handling. When the HTTP request stream emits an error, the internal `busboy` stream is not closed, violating Node.js stream safety guidance. This leads to unclosed streams accumulating over time, consuming memory and file descriptors. Under sustained or repeated failure conditions, this can result in denial of service, requiring manual server restarts to recover. All users of Multer handling file uploads are potentially impacted. Users should upgrade to 2.0.0 to receive a patch. No known workarounds are available.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-20 14:29 UTC
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/expressjs/multer/security/advi… | x_refsource_CONFIRM |
| https://github.com/expressjs/multer/pull/1120 | x_refsource_MISC |
| https://github.com/expressjs/multer/commit/2c8505… | x_refsource_MISC |
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