{"cve":"CVE-2026-45056","nvd":{"published":"2026-09-11T22:16:37.263","modified":"2026-09-30T19:57:08.043","status":"Deferred","description":"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_v4":{"vector":"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","score":6.9},"cvss_v3":null,"cwes":["CWE-290"],"references":["https://github.com/matrix-org/matrix-rust-sdk/pull/6553","https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1","https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-wfq4-36m3-9g42","https://rustsec.org/advisories/RUSTSEC-2026-0159.html"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-45056","score":0.00308,"percentile":0.23343,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wfq4-36m3-9g42","url":"https://osv.dev/vulnerability/GHSA-wfq4-36m3-9g42","summary":"Matrix Rust SDK: Sender-binding gaps in to-device and room-key attribution","modified":"2026-06-04T15:00:08.092172510Z","packages":[{"ecosystem":"crates.io","name":"matrix-sdk-crypto","purl":"pkg:cargo/matrix-sdk-crypto","ranges":[">=0.12.0 <0.16.1"],"fixed":["0.16.1"]}]},{"id":"RUSTSEC-2026-0159","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0159","summary":"Sender-binding gaps in to-device messages","modified":"2026-10-12T18:00:09.240103517Z","packages":[{"ecosystem":"crates.io","name":"matrix-sdk-crypto","purl":"pkg:cargo/matrix-sdk-crypto","ranges":[">=0.12.0 <0.16.1"],"fixed":["0.16.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}