CVE-2026-8159
Description
[email protected] 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 [email protected] or higher.
How to fix
- pillarjs multiparty4.3.0 or later
- multiparty4.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pillarjs multiparty | v < 4.3.0 | 4.3.0 |
| multipartynpm | v < 4.3.0 | 4.3.0 |
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Attack Surface Management
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