PYSEC-2026-664 Matrix Synapse Security Filtering Flaw

The ongetmissingevents function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the getmissingevents federation API where event visibility rules were not applied correctly...

EUVD-2022-5320

Malicious code in bioql PyPI...

Signature Verification Bypass

github.com/matrix-org/dendrite is vulnerable to signature verification bypass. A remote attacker is able to provide invalid or modified malicious events to spread via an endpoint because the events retrieved from a remote homeserver using the /getmissingevents path does not verify their signature...

CVE-2022-39200: Improper Verification of Cryptographic Signature

Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the /getmissingevents path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this...

CVE-2018-12291

The ongetmissingevents function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the getmissingevents federation API where event visibility rules were not applied correctly...

CVE-2018-12291

Summary: Matrix Synapse before 0.31.1 has a bug in on_get_missing_events ( federation.py ) where event visibility rules were not applied correctly in get_missing_events, potentially exposing incorrect events. Impact: as described in multiple advisories; CVE-2018-12291. Remediation: upgrade to Syn...