multiparty vulnerable to Denial of Service via unbounded part-header accumulation
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-400.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| multiparty | multiparty | 2.1.0 to before 4.3.1 | 4.3.1 | Patch available | CNA |
- multiparty Vendormultiparty Affected 2.1.0 to before 4.3.1 Fixed in 4.3.1 Patch available CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:pillarjs:multiparty:*:*:*:*:*:*:*:* | — | — | multiparty |
- cpe:2.3:a:pillarjs:multiparty:*:*:*:*:*:*:*:* Versions — — ·multiparty
Remediation
- Fix · CNA multiparty (multiparty) Fixed in 4.3.1
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Fuse 7 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-87908
References
More multiparty vulnerabilities
- TI-2024-35311 path-to-regexp Unpatched `path-to-regexp` ReDoS in 0.1.x CVSS 4.0HIGH 7.7
- TI-2024-30367 path-to-regexp outputs backtracking regular expressions CVSS 3.1HIGH 7.5
- TI-2026-04296 path-to-regexp vulnerable to Denial of Service via sequential optional groups CVSS 3.1HIGH 7.5
- TI-2026-07187 multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing CVSS 3.1HIGH 7.5
- TI-2026-07186 multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception CVSS 3.1HIGH 7.5
- TI-2026-07185 multiparty vulnerable to ReDoS via filename parsing CVSS 3.1HIGH 7.5
Sources
- CVE-2026-87908 · CVE Program
- CVE-2026-87908 · NVD
- FIRST EPSS
- CVE-2026-87908 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences