CVE-2025-49090

high

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.

References

References
More

https://www.theregister.com/2025/08/13/secure_chat_darling_matrix_admits/

https://therecord.media/matrix-messaging-protocol-high-severity-vulnerabilities

https://matrix.org/blog/2025/08/security-release/

https://matrix.org/blog/2025/08/project-hydra-improving-state-res/

https://github.com/matrix-org/matrix-spec/releases/tag/v1.16

https://github.com/Nheko-Reborn/nheko/issues/1931

Details

Source: Mitre, NVD

Published: 2025-10-02

Updated: 2025-10-06

Risk Information

CVSS v2

Base Score: 5.6

Vector: CVSS2#AV:N/AC:H/Au:S/C:N/I:C/A:P

Severity: Medium

CVSS v3

Base Score: 7.1

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L

Severity: High

EPSS

EPSS: 0.00039