CVE-2022-39200

HIGH

Dendrite < 0.9.8 - Improper Verification of Cryptographic Signature via /get_missing_events Endpoint

Title source: llm

Description

Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.

References (2)

Core 2

Core References

Third Party Advisory x_refsource_confirm

https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c

Patch, Third Party Advisory x_refsource_misc

https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3

View Patch ZIP pw:eip

Scores

CVSS v3 7.3

EPSS 0.0031

EPSS Percentile 23.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-347

Status published

Products (2)

matrix/dendrite < 0.9.8

matrix-org/dendrite 0 - 0.9.8Go

Published Sep 12, 2022

Tracked Since Feb 18, 2026