synapse vulnerabilities and fixes

Recent CVEs affecting synapse, with upgrade or downgrade steps. 2 tracked.

synapse has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 2. Most recent: 2026-05-28. Highest priority: CVE-2026-45078 (score 20/100).

• CVE-2026-45078 MEDIUM 5.5 UPGRADE Synapse is an open source Matrix homeserver implementation
• CVE-2026-45076 LOW 2.7 UPGRADE Synapse is an open source Matrix homeserver implementation

FAQ

How do I fix synapse vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is synapse being exploited right now?

None of the tracked synapse CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which synapse CVE should I patch first?

CVE-2026-45078 currently ranks highest (20/100): Synapse is an open source Matrix homeserver implementation.

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