Prototype pollution in matrix-js-sdk (part 2)
Impact
In certain configurations, data sent by remote servers containing special strings in key locations could cause modifications of the Object.prototype, disrupting matrix-js-sdk functionality, causing denial of service and potentially affecting program logic.
(This is part 2, where CVE-2022-36059 / GHSA-rfv9-x7hh-xc32 is part 1. Part 2 covers remaining vectors not covered by part 1, found in a codebase audit scheduled after part 1.)
Patches
The issue has been patched in matrix-js-sdk 24.0.0.
Workarounds
None.
References
- Release blog post
- The advisory GHSA-rfv9-x7hh-xc32 (CVE-2022-36059) refers to an initial set of vulnerable locations discovered and patched in matrix-js-sdk 19.4.0. We opted not to disclose that advisory while we performed an audit of the codebase and are now disclosing it jointly with this one.
For more information
If you have any questions or comments about this advisory please email us at security at matrix.org.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | matrix-js-sdk | < 24.0.0 | 24.0.0 |
References
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-mwq8-fjpf-c2gr
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-rfv9-x7hh-xc32
- https://nvd.nist.gov/vuln/detail/CVE-2023-28427
- https://github.com/matrix-org/matrix-js-sdk
- https://lists.debian.org/debian-lts-announce/2023/04/msg00027.html
- https://matrix.org/blog/2023/03/28/security-releases-matrix-js-sdk-24-0-0-and-matrix-react-sdk-3-69-0
- https://security.gentoo.org/glsa/202305-36
- https://www.debian.org/security/2023/dsa-5392
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H- Weakness (CWE)
CWE-1321- Platform
- npm
- Package
matrix-js-sdk- Disclosed
- 30.03.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-mwq8-fjpf-c2gr - 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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