PYSEC-2026-664
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/matrix-synapse/PYSEC-2026-664.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-664
- Aliases
- Published
- 2026-07-02T14:13:24.881978Z
- Modified
- 2026-07-06T08:00:38.802498302Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- Matrix Synapse Security Filtering Flaw
- Details
-
The
on_get_missing_eventsfunction 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. - References
-
- https://nvd.nist.gov/vuln/detail/CVE-2018-12291
- https://github.com/matrix-org/synapse/pull/3371
- https://github.com/matrix-org/synapse/commit/0834b49c6a9b6c597a154d4b2dfcf8fff90699ec
- https://github.com/matrix-org/synapse
- https://github.com/matrix-org/synapse/releases/tag/v0.31.1
- https://pypi.org/project/matrix-synapse
- https://github.com/advisories/GHSA-v8wm-g9f2-xjv4
Affected packages
PyPI / matrix-synapse
Package
- Name
- matrix-synapse
- View open source insights on deps.dev
- Purl
- pkg:pypi/matrix-synapse