Synology DSM Update Version 7.4-90075

DSM 7.4-90075 (2026-06-16) adds LDAP SMB authentication visibility, GPU info in Info Center, and improved KMIP certificate handling. It also fixes SSO, NFS, networking, update, and Package Center issues, and includes security fixes for Ghostscript CVE-2023-43115 and other vulnerabilities.

• Fixed security vulnerabilities regarding Ghostscript (CVE-2023-43115).
• Fixed multiple security vulnerabilities.
• Improved KMIP certificate handling and added Log Center records for failures caused by expired Synology certificates.
• Enhanced authentication stability for SSO/CAS/SAML sign-in flows, including special-character usernames and redirect-loop handling.

• Improved message clarity and error handling in the SSO client.
• Fixed an infinite redirect loop when DSM was configured as both an SSO Server and client pointing to the same server.
• Fixed SAML-authenticated usernames not appearing in Log Center when no local or directory user match was found.
• Fixed NFS WriteOnce upload locking and an extra krb5i option shown in NFS permission settings.
• Fixed IEEE 802.3ad Link Aggregation creation/function issues after updating to DSM 7.3.
• Fixed improper shutdown behavior when enabling IPv6 under certain circumstances.
• Fixed external network access remaining available after all gateways were deleted.
• Fixed missing licenses on Virtual DSM after restart.
• Fixed Synology Drive Admin Console not functioning properly after installing or updating to DSM 7.3.
• Fixed false insufficient-space precheck blocking DSM updates.
• Fixed Package Center connection failures to Synology servers in IPv6 environments.
• Fixed system logs not attaching to support tickets in Support Center.

• DSM now shows supported SMB authentication methods when joining an LDAP server.
• Added GPU information display in Info Center.
• Synology certificates now support exporting an additional CA file for KMIP client authentication.

• After installing this update, downgrade to a previous DSM version is not possible.
• This update restarts the Synology NAS.
• If auto update does not run, perform a manual update in Control Panel and complete the required actions before updating.
• Some models will not receive this update through notifications and can only download the upgrade patch from Synology Download Center.
• For the listed models, DSM 7.4 will be the last upgradable version.
• Compatibility updates may be required for Synology Chat Server, HighAvailability(SHA), Synology MailPlus Server, PACS, QuickConnect, ReplicationService, SecureSignIn, SnapshotReplication, and WebStation.
• PHP 8.1, Mail Station, and Synology Mail Server are no longer supported.
• This version is released in a staged rollout.

Product Information

Vendor: Synology

Product: DSM

Product type: Other

Application category: Utilities

Platform: Linux

Version: 7.4-90075

Vendor release date: Jun 16, 2026

Published on updatealert.io: Jun 16, 2026

Description: Operating system and management software for Synology NAS devices.