CVE-2026-45056Matrix Rust SDK: Sender-binding gaps in to-device and room-key attribution
Updated under an hour ago ()
Does this affect you?
It affects matrix-org matrix-rust-sdk. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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matrix-sdk-crypto is a no-network-IO implementation of a state machine that handles end-to-end encryption for Matrix clients. Starting in version 0.12.0 and prior to version 0.17.0, the matrix-sdk-crypto crate was missing a check for the user ID when decrypting an Olm-encrypted event containing the `sender_device_keys` property. This could be exploited to forge an encrypted to-device event, but only if the attacker colludes with the homeserver operator. This issue is fixed in matrix-sdk-crypto 0.17.0. There are no known workarounds for the issue.
- CVSS
- 6.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-290
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
matrix-org matrix-rust-sdk matrix_org:matrix_rust_sdk (from the name) | from 0.12.0, < 0.16.1 | CNA record |
References
- https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-wfq4-36m3-9g42x-refsource-confirm
- https://github.com/matrix-org/matrix-rust-sdk/pull/6553x-refsource-misc
- https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1x-refsource-misc
- https://rustsec.org/advisories/RUSTSEC-2026-0159.htmlx-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.