| Package | Affected versions | Patched versions |
|---|---|---|
| multiparty | < 4.3.0 | 4.3.0 |
| multiparty | < 4.3.0 | 4.3.0 |
[email protected] and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A multipart upload with a long header value containing !filename="1 repeated can cause regex matching to take seconds, blocking the event loop. Any service accepting multipart uploads via multiparty is affected.
Users should upgrade to [email protected] or higher.
None. Limiting upload sizes at the proxy/gateway layer reduces but does not eliminate the attack surface, since a small ~8 KB header is sufficient to trigger the vulnerable backtracking.
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