# CVE-2022-41952: matrix-synapse: Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for media stream U...

CVE-2022-41952 is fixed in matrix-synapse on 1 platform by DEBIAN-CVE-2022-41952 (version 1.53.0-1), released November 22, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-41952
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0094
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 22, 2022

## Description

Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for media stream URLs without properly limiting connection time. Connections will only be terminated after `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived connections towards the streaming media server (for instance, Icecast). This can cause excessive traffic and connections toward such servers if their stream URL is, for example, posted to a large room with many Synapse instances with URL preview enabled. Version 1.52.0 implements a timeout mechanism which will terminate URL preview connections after 30 seconds. Since generating URL previews for media streams is not supported and always fails, 1.53.0 additionally implements an allow list for content types for which Synapse will even attempt to generate a URL preview. Upgrade to 1.53.0 to fully resolve the issue. As a workaround, turn off URL preview functionality by setting `url_preview_enabled: false` in the Synapse configuration file.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | matrix-synapse Debian 14 | 1.53.0-1 | [DEBIAN-CVE-2022-41952](https://patchblox.com/security/data/fix/linux/debian-cve-2022-41952.md) | Nov 22, 2022 |

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