matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. In versions prior to 24.0.0 events sent with special strings in key places can temporarily disrupt or impede the matrix-js-sdk from functioning properly, potentially impacting the consumer's ability to process data safely. Note that the matrix-js-sdk can appear to be operating normally but be excluding or corrupting runtime data presented to the consumer. This vulnerability is distinct from GHSA-rfv9-x7hh-xc32 which covers a similar issue. The issue has been patched in matrix-js-sdk 24.0.0 and users are advised to upgrade. There are no known workarounds for this vulnerability.
https://www.debian.org/security/2023/dsa-5392
https://security.gentoo.org/glsa/202305-36
https://lists.debian.org/debian-lts-announce/2023/04/msg00027.html
https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-mwq8-fjpf-c2gr