External Control of Critical State Data Affecting Nheko-Reborn/mtxclient package, versions [,0.10.1)
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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- published6 Oct 2025
- disclosed2 Oct 2025
- creditUnknown
Introduced: 2 Oct 2025
NewCVE-2025-49090 (opens in a new tab)How to fix?
Upgrade Nheko-Reborn/mtxclient to version 0.10.1 or higher.
Overview
Affected versions of this package are vulnerable to External Control of Critical State Data due to insufficient validation in the State Resolution 2.0 algorithm. A malicious homeserver operator can corrupt the chatroom’s state by resetting it to a prior value (e.g. reverting access control or room membership to an earlier configuration).
Note:
This issue does not expose conversation history nor any additional data and only affects servers which are federating with untrusted or potentially malicious servers, such as participating in the public Matrix network.