What’s Vulnerable › Vulnerabilities

CVE-2022-39252: When matrix-rust-sdk recieves forwarded room keys, the reciever doesn't check if it requested the key from the forwarder

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-09-29 · updated 2026-06-17
• Weakness: CWE-287

Description

matrix-rust-sdk is an implementation of a Matrix client-server library in Rust, and matrix-sdk-crypto is the Matrix encryption library. Prior to version 0.6, when a user requests a room key from their devices, the software correctly remembers the request. When the user receives a forwarded room key, the software accepts it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.6 fixes this issue.

Affected products

• matrix-org matrix-rust-sdk: before 0.6 — fixed in 0.6

How to fix

Upgrade to a fixed version: matrix-org matrix-rust-sdk 0.6. Check the vendor advisory for mitigations.

References

• https://github.com/matrix-org/matrix-rust-sdk/commit/093fb5d0aa21c0b5eaea6ec96b477f1075271cbb
• https://github.com/matrix-org/matrix-rust-sdk/commit/41449d2cc360e347f5d4e1c154ec1e3185f11acd
• https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.6.0
• https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-vp68-2wrm-69qm
• https://github.com/matrix-org/matrix-rust-sdk/commit/093fb5d0aa21c0b5eaea6ec96b477f1075271cbb
• https://github.com/matrix-org/matrix-rust-sdk/commit/41449d2cc360e347f5d4e1c154ec1e3185f11acd
• https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.6.0
• https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-vp68-2wrm-69qm

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