CVE-2025-49090

Description

The Matrix specification before 1.16 (i.e., with a room version before 12 and State Resolution before 2.1) has deficient state resolution.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://matrix.org/blog/2025/08/security-release/
• https://github.com/Nheko-Reborn/nheko/issues/1931
• https://github.com/matrix-org/matrix-spec/releases/tag/v1.16
• https://matrix.org/blog/2025/08/project-hydra-improving-state-res/