Medium severityNVD Advisory· Published Sep 11, 2026· Updated Sep 30, 2026
CVE-2026-45056
CVE-2026-45056
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-sdk-cryptocrates.io | >= 0.12.0, < 0.16.1 | 0.16.1 |
Affected products
3- Range: <0.16.1
- Range: <0.16.1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-wfq4-36m3-9g42ghsaADVISORY
- github.com/matrix-org/matrix-rust-sdk/pull/6553nvdWEB
- github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1nvdWEB
- github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-wfq4-36m3-9g42nvdWEB
- rustsec.org/advisories/RUSTSEC-2026-0159.htmlnvdWEB
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