What’s Vulnerable › Vulnerabilities

CVE-2025-49090

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-02 · updated 2026-10-12
• Weakness: CWE-642

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.

Affected products

• Matrix specification: before 1.16 — fixed in 1.16

How to fix

Upgrade to a fixed version: Matrix specification 1.16. Check the vendor advisory for mitigations.

References

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

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