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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| matrix-synapse | pip | < 1.120.1 | 1.120.1 |
The vulnerability stems from improper handling of multipart/form-data requests. Synapse's media upload endpoint (MediaRepositoryResource) likely processes these requests using Twisted's HTTP stack. The high-confidence entry points to Synapse's own media handling code where Content-Type validation was missing before processing. The medium-confidence Twisted function shows the underlying framework behavior that exacerbates the issue when unsupported content types are allowed. The CWE-770 alignment and references to Twisted's multipart processing issues (#4688) support this analysis.