SB2023052450 - Input validation error in Synapse
Published: May 24, 2023 Updated: May 4, 2026
Security Bulletin ID
SB2023052450
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2023-32323)
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in invite_room_state handling when processing room invites. A remote user can create an oversized invite event to cause a denial of service.
Only Synapse instances with federation enabled are affected, and exploitation requires permission to create certain state events.
Remediation
Install update from vendor's website.