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8 vulnerabilities found for multiparty by multiparty
CVE-2026-87908 (GCVE-0-2026-87908)
Vulnerability from nvd – Published: 2026-09-11 06:37 – Updated: 2026-09-11 15:54
VLAI
EPSS
VEX
Title
multiparty vulnerable to Denial of Service via unbounded part-header accumulation
Summary
multiparty is a Node.js library for parsing multipart/form-data request bodies. In versions from 2.1.0 up to but not including 4.3.1, the parser does not bound the amount of memory used while accumulating the headers of a single multipart part. An unauthenticated attacker can send a single request whose part carries a very large volume of header bytes, forcing the parser to buffer all of them and exhausting the process memory, which crashes the server. This is a denial of service with no confidentiality or integrity impact. The issue is fixed in multiparty 4.3.1, which caps the size of the accumulated part headers. Users should upgrade to multiparty 4.3.1 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 15:53 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
2.1.0 , < 4.3.1
(semver)
Unaffected: 4.3.1 (semver) |
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CVE-2026-8162 (GCVE-0-2026-8162)
Vulnerability from nvd – Published: 2026-05-12 09:05 – Updated: 2026-05-12 12:33
VLAI
EPSS
VEX
Title
multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing
Summary
multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a Content-Disposition header whose filename* parameter contains a malformed percent-encoding, the parser invokes decodeURI on the value without try/catch. The resulting URIError propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 12:32 UTC
CWE
- CWE-755 - Improper Handling of Exceptional Conditions
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
0 , ≤ 4.2.3
(semver)
Unaffected: 4.3.0 (semver) |
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CVE-2026-8161 (GCVE-0-2026-8161)
Vulnerability from nvd – Published: 2026-05-12 08:50 – Updated: 2026-05-12 12:32
VLAI
EPSS
VEX
Title
multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception
Summary
multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 12:31 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
0 , ≤ 4.2.3
(semver)
Unaffected: 4.3.0 (semver) |
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CVE-2026-8159 (GCVE-0-2026-8159)
Vulnerability from nvd – Published: 2026-05-12 08:35 – Updated: 2026-05-12 12:33
VLAI
EPSS
VEX
Title
multiparty vulnerable to ReDoS via filename parsing
Summary
multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 12:33 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
0 , ≤ 4.2.3
(semver)
Unaffected: 4.3.0 (semver) |
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CVE-2026-87908 (GCVE-0-2026-87908)
Vulnerability from cvelistv5 – Published: 2026-09-11 06:37 – Updated: 2026-09-11 15:54
VLAI
EPSS
VEX
Title
multiparty vulnerable to Denial of Service via unbounded part-header accumulation
Summary
multiparty is a Node.js library for parsing multipart/form-data request bodies. In versions from 2.1.0 up to but not including 4.3.1, the parser does not bound the amount of memory used while accumulating the headers of a single multipart part. An unauthenticated attacker can send a single request whose part carries a very large volume of header bytes, forcing the parser to buffer all of them and exhausting the process memory, which crashes the server. This is a denial of service with no confidentiality or integrity impact. The issue is fixed in multiparty 4.3.1, which caps the size of the accumulated part headers. Users should upgrade to multiparty 4.3.1 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 15:53 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
2.1.0 , < 4.3.1
(semver)
Unaffected: 4.3.1 (semver) |
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CVE-2026-8162 (GCVE-0-2026-8162)
Vulnerability from cvelistv5 – Published: 2026-05-12 09:05 – Updated: 2026-05-12 12:33
VLAI
EPSS
VEX
Title
multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing
Summary
multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a Content-Disposition header whose filename* parameter contains a malformed percent-encoding, the parser invokes decodeURI on the value without try/catch. The resulting URIError propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 12:32 UTC
CWE
- CWE-755 - Improper Handling of Exceptional Conditions
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
0 , ≤ 4.2.3
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CVE-2026-8161 (GCVE-0-2026-8161)
Vulnerability from cvelistv5 – Published: 2026-05-12 08:50 – Updated: 2026-05-12 12:32
VLAI
EPSS
VEX
Title
multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception
Summary
multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 12:31 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
0 , ≤ 4.2.3
(semver)
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CVE-2026-8159 (GCVE-0-2026-8159)
Vulnerability from cvelistv5 – Published: 2026-05-12 08:35 – Updated: 2026-05-12 12:33
VLAI
EPSS
VEX
Title
multiparty vulnerable to ReDoS via filename parsing
Summary
multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 12:33 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
0 , ≤ 4.2.3
(semver)
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"assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
"assignerShortName": "openjs",
"cveId": "CVE-2026-8159",
"datePublished": "2026-05-12T08:35:39.564Z",
"dateReserved": "2026-05-08T09:45:28.532Z",
"dateUpdated": "2026-05-12T12:33:59.418Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}