CVE-2026-87908
multiparty vulnerable to Denial of Service via unbounded part-header accumulation
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
7.5
multiparty vulnerable to Denial of Service via unbounded part-header accumulation
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.
- Record
CVE-2026-87908- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400, CWE-770
- Updated
- 2026-11-02
EUVDEUVD-2026-75976
7.5
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.
- Record
EUVD-2026-75976- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
NVD
7.5
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.
- Record
CVE-2026-87908- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400, CWE-770
- Updated
- 2026-11-02
OSV
7.5
multiparty vulnerable to Denial of Service via unbounded part-header accumulation
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.
- Record
CVE-2026-87908- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400, CWE-770
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-87908
7.5
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.
- Record
DEBIAN-CVE-2026-87908- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-87908
7.5
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.
- Record
UBUNTU-CVE-2026-87908- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
node-multipartyDebian:12 |
All versions, plus listed versions 4.2.3-24.2.3-34.2.3-44.2.3-54.3.0+~4.2.1-14.3.0-14.3.1+~4.2.1-1 |
None known |
node-multipartyDebian:13 |
All versions, plus listed versions 4.2.3-34.2.3-44.2.3-54.3.0+~4.2.1-14.3.0-14.3.1+~4.2.1-1 |
None known |
node-multipartyDebian:14 |
before 4.3.1+~4.2.1-1, plus listed versions 4.2.3-34.2.3-44.2.3-54.3.0+~4.2.1-14.3.0-1 |
4.3.1+~4.2.1-1 |
node-multipartyUbuntu:16.04:LTS |
All versions, plus listed versions 4.0.0-1 |
None known |
node-multipartyUbuntu:18.04:LTS |
All versions, plus listed versions 4.0.0-14.0.0-1ubuntu1 |
None known |
node-multipartyUbuntu:20.04:LTS |
All versions, plus listed versions 4.2.1-14.2.1-2 |
None known |
node-multipartyUbuntu:22.04:LTS |
All versions, plus listed versions 4.2.2-24.2.2-3 |
None known |
node-multipartyUbuntu:24.04:LTS |
All versions, plus listed versions 4.2.3-2 |
None known |
node-multipartyUbuntu:26.10 |
All versions, plus listed versions 4.2.3-54.3.0+~4.2.1-1 |
None known |
node-multipartyUbuntu:26.04:LTS |
All versions, plus listed versions 4.2.3-34.2.3-4build14.2.3-5 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-87908 is a high vulnerability (CVSS 7.5) in Multiparty, published September 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. Fixed in node-multiparty 4.3.1+~4.2.1-1.
References
github.com/pillarjs/multiparty/security/advisories/GHSA-5h46-2939-q3wh
cna.openjsf.org/security-advisories.html
github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87908.json
nvd.nist.gov/vuln/detail/CVE-2026-87908
security-tracker.debian.org/tracker/CVE-2026-87908
ubuntu.com/security/CVE-2026-87908
cve.org/CVERecord?id=CVE-2026-87908