Low severityNVD Advisory· Published Dec 9, 2025· Updated Dec 9, 2025
matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values
CVE-2025-66622
Description
matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-sdk-basecrates.io | < 0.16.0 | 0.16.0 |
Affected products
2- Range: < 0.16.0
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-jj6p-3m75-g2p3ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-66622ghsaADVISORY
- github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0ghsax_refsource_MISCWEB
- github.com/matrix-org/matrix-rust-sdk/pull/5924ghsax_refsource_MISCWEB
- github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3ghsax_refsource_CONFIRMWEB
- rustsec.org/advisories/RUSTSEC-2025-0135.htmlghsax_refsource_MISCWEB
News mentions
0No linked articles in our index yet.