matrix-js-sdk vulnerable to invisible eavesdropping in group calls
Impact
An attacker present in a room where an MSC3401 group call is taking place can eavesdrop on the video and audio of participants using matrix-js-sdk, without their knowledge. To affected matrix-js-sdk users, the attacker will not appear to be participating in the call.
This attack is possible because matrix-js-sdk's group call implementation accepts incoming direct calls from other users, even if they have not yet declared intent to participate in the group call, as a means of resolving a race condition in call setup. Affected versions do not restrict access to the user's outbound media in this case.
Legacy 1:1 calls are unaffected.
Workarounds
Users may hold group calls in private rooms where only the exact users who are expected to participate in the call are present.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | matrix-js-sdk | < 24.1.0 | 24.1.0 |
References
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
- https://nvd.nist.gov/vuln/detail/CVE-2023-29529
- https://github.com/matrix-org/matrix-spec-proposals/pull/3401
- https://github.com/matrix-org/matrix-js-sdk
- https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N- Weakness (CWE)
CWE-862- Platform
- npm
- Package
matrix-js-sdk- Disclosed
- 14.04.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6g67-q39g-r79q - CC BY 4.0
Vulnerability history: matrix-js-sdk
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 12
- First → latest
- 09.2021 09.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 6
- Medium 6
Disclosures per year
- 2021: 1
- 2022: 4
- 2023: 3
- 2024: 3
- 2025: 1
- 2026: 0
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