CVE catalog
CVE-2026-8159
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
- Severity
- High · CVSS 7.5
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | node-multiparty | sid | 4.3.1+~4.2.1-1 | fixed |
| Debian | node-multiparty | forky | 4.3.1+~4.2.1-1 | fixed |
| Debian | node-multiparty | trixie | 4.2.3-3 | vulnerable |
| Debian | node-multiparty | bookworm | 4.2.3-2 | vulnerable |
| Cpe | node-multiparty | Not reported | Not reported | vulnerable |
| Cpe | multiparty | Not reported | 4.3.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | node-multiparty | source | sid | 4.3.0-1 | not yet assigned | Not reported | [1136447] |
| Debian | node-multiparty | source | forky | 4.3.0-1 | not yet assigned | Not reported | [1136447] |
| Debian | node-multiparty | source | trixie | (unfixed) | not yet assigned | Not reported | [1136447] |
| Debian | node-multiparty | source | bookworm | (unfixed) | not yet assigned | Not reported | [1136447] |
| Cpe | multiparty | cpe | Not reported | 4.3.0 | Not reported | Not reported | Not reported |
Notes
[trixie] node-multiparty: Minor issue [bookworm] node-multiparty: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [node-multiparty]Affected
Details (2)
4.2.3-2· all · bookwormAffected
nvd · node-multiparty · debian · bookworm; nvd · node-multiparty · debian · 12
4.2.3-2· all · bookwormAffected
nvd · node-multiparty · debian · bookworm; nvd · node-multiparty · debian · 12
[Debian 13 (Trixie)]
- [node-multiparty]Affected
Details (2)
4.2.3-3· all · trixieAffected
nvd · node-multiparty · debian · 13
4.2.3-3· all · trixieAffected
nvd · node-multiparty · debian · 13
Observed: