Improper Handling of Exceptional Conditions Affecting matrix-sdk-base package, versions <0.16.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-MATRIXSDKBASE-14236604
- published10 Dec 2025
- disclosed8 Dec 2025
- creditUnknown
Introduced: 8 Dec 2025
NewCVE-2025-66622 (opens in a new tab)How to fix?
Upgrade matrix-sdk-base to version 0.16.0 or higher.
Overview
matrix-sdk-base is a This crate implements the base to build a Matrix client library.
Crate Feature Flags The following crate feature flags are available:
encryption: Enables end-to-end encryption support in the library. qrcode: Enables QRcode generation and reading code. testing: Provides facilities and functions for tests, in particular for integration testing store implementations. ATTENTION: do not ever use outside of tests, we do not provide any stability warantees on these, these are merely helpers. If you find you need any function provided here outside of tests, please open a Github Issue and inform us about your use case for us to consider.
Affected versions of this package are vulnerable to Improper Handling of Exceptional Conditions via the processing of sync responses containing custom m.room.join_rules values. An attacker can cause the process to stall, preventing further processing for all rooms, by inviting a user to a room with non-standard join rules.
Workaround
This vulnerability can be mitigated by leaving affected rooms on another client.