CVE-2023-45129

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.

• CWE-770
• CWE-770

• https://github.com/matrix-org/synapse/pull/16360Patch, Vendor Advisory
• https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/Mailing List
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/Mailing List
• https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-versionRelease Notes
• https://security.gentoo.org/glsa/202401-12
• https://github.com/matrix-org/synapse/pull/16360Patch, Vendor Advisory
• https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/Mailing List
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/Mailing List
• https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-versionRelease Notes
• https://security.gentoo.org/glsa/202401-12

Published

Oct 10, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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