CVE Catalog

CVE-2026-45056

MediumCVSS 6.9
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.31%

21th percentile - higher than 21% of all known CVEs

Summary

matrix-sdk-crypto starting in version 0.12.0 and prior to version 0.17.0 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.

Risk Assessment

It enables forging to-device events when colluding with the server operator, potentially compromising communication integrity. There are no known workarounds.

Recommendation

Update matrix-sdk-crypto to version 0.17.0, which fixes the issue.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS