PatchTheCVECVE-2026-8162: multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception
CVE-2026-8162 is a high-severity flaw (CVSS 7.5) affecting multiparty. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 aff
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 75%) |
| CISA exploited list | No |
| Weakness | CWE-755 |
| Published | 2026-05-12 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-8162?
multiparty: upgrade to 4.3.0. Exact commands for each OS are on this page.
Is CVE-2026-8162 being exploited?
CVE-2026-8162 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-8162 affect?
CVE-2026-8162 affects multiparty. Severity is high (CVSS 7.5). 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
How urgent is CVE-2026-8162?
Priority 38/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-8161 HIGH 7.5 UPGRADE multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception
- CVE-2026-8159 HIGH 7.5 UPGRADE multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in