PYSEC-2026-845
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/matrix-synapse/PYSEC-2026-845.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-845
- Aliases
- Published
- 2026-07-06T08:03:21.195845Z
- Modified
- 2026-07-07T11:46:05.859030580Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- Matrix Synapse Improper Signature Validation
- Details
-
Matrix Synapse before 0.33.3.1 and 0.33.2.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation.
- References
-
- https://nvd.nist.gov/vuln/detail/CVE-2018-16515
- https://github.com/matrix-org/synapse/issues/3796#event-1833126269
- https://github.com/matrix-org/synapse/commit/5bf8bc79ebc22c61968f2eb487714813fccbdb9b
- https://github.com/matrix-org/synapse/commit/804dd41e18c449e711e443398b95c9f6c68b6fa2
- https://github.com/matrix-org/synapse/commit/a5a0bf5cf71caed3c4e3677d2bce667c147dadfc
- https://github.com/matrix-org/synapse/commit/c127c8d0421f0228a46ebbe280c9537e8d8ea42b
- https://github.com/matrix-org/synapse
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IRW7YR2H3ASUSYX4AO4KMY3FNVDNYW3P
- https://matrix.org/blog/2018/09/06/critical-security-update-synapse-0-33-3-1
- https://pypi.org/project/matrix-synapse
- https://github.com/advisories/GHSA-fmvh-rvq5-hhjx
Affected packages
PyPI / matrix-synapse
Package
- Name
- matrix-synapse
- View open source insights on deps.dev
- Purl
- pkg:pypi/matrix-synapse