[Bug]: Encrypted files become corrupted after restoring a version

⚠️ This issue respects the following points: ⚠️

This is a bug, not a question or a configuration/webserver/proxy issue.
This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
I agree to follow Nextcloud's Code of Conduct.

Bug description

When a file has multiple versions, simply switching back and forth between a few of them causes the file to become corrupted.

This appears to occur when server-side encryption is combined with the versioning app.

We have confirmed a similar issue in Nextcloud 33.0.5 and 30.0.17.

Steps to reproduce

For example, with a file that has two versions, the file becomes corrupted and can no longer be downloaded after just four version rollbacks: Ver2 > Ver1 > Ver2 > Ver1 > Ver2.

This situation is similar to the following issue, but it may be slightly different.
#49125

Expected behavior

Even after restoring a version, the files do not become corrupted, nor do they become undownloadable.

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Nginx

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

What user-backends are you using?

Default user-backend (database)
LDAP/ Active Directory
SSO - SAML
Other

Configuration report

{
    "system": {
        "logtimezone": "Asia\/Tokyo",
        "maintenance_window_start": 16,
        "default_language": "ja",
        "default_locale": "ja_JP",
        "default_phone_region": "JP",
        "default_app": "dashboard,files",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "tempdirectory": "\/home\/nextcloud\/data\/temp",
        "log_type": "file",
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "log_type_audit": "file",
        "logfile_audit": "\/var\/log\/nextcloud\/audit.log",
        "logdateformat": "Y-m-d H:i:s",
        "loglevel": 2,
        "log_rotate_size": 0,
        "log.condition": {
            "apps": [
                "admin_audit"
            ]
        },
        "has_internet_connection": true,
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "filelocking.enabled": "true",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379,
            "timeout": 0,
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "33.0.5.1",
        "overwrite.cli.url": "https:\/\/nc33.nextcloud.biz",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "maintenance": false,
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": true,
        "mail_smtpport": "587",
        "mail_sendmailmode": "smtp",
        "mail_smtpstreamoptions": {
            "ssl": {
                "allow_self_signed": false,
                "verify_peer": true,
                "verify_peer_name": true
            }
        },
        "defaultapp": "dashboard,files",
        "app_install_overwrite": [],
        "theme": "",
        "serverid": 10
    }
}

List of activated Apps

Enabled:
  - activity: 6.0.0
  - admin_audit: 1.23.0
  - bruteforcesettings: 6.0.0
  - calendar: 6.5.0
  - circles: 33.0.0
  - cloud_federation_api: 1.17.0
  - comments: 1.23.0
  - contacts: 8.7.1
  - contactsinteraction: 1.14.1
  - dashboard: 7.13.0
  - dav: 1.36.0
  - encryption: 2.21.0
  - federatedfilesharing: 1.23.0
  - federation: 1.23.0
  - files: 2.5.0
  - files_accesscontrol: 4.0.1
  - files_automatedtagging: 4.0.0
  - files_downloadlimit: 5.1.0
  - files_external: 1.25.1
  - files_pdfviewer: 6.0.0
  - files_reminders: 1.6.0
  - files_retention: 4.0.1
  - files_sharing: 1.25.2
  - files_trashbin: 1.23.0
  - files_versions: 1.26.0
  - firstrunwizard: 6.0.0
  - fulltextsearch_elasticsearch: 33.0.0
  - groupfolders: 21.0.8
  - logreader: 6.0.0
  - lookup_server_connector: 1.21.0
  - nextcloud_announcements: 5.0.0
  - notifications: 6.0.0
  - notify_push: 1.3.3
  - oauth2: 1.21.0
  - password_policy: 5.0.0
  - photos: 6.0.0
  - privacy: 5.0.0
  - profile: 1.2.0
  - provisioning_api: 1.23.0
  - recommendations: 6.0.0
  - related_resources: 4.0.0
  - serverinfo: 5.0.0
  - settings: 1.16.0
  - sharebymail: 1.23.0
  - support: 5.0.0
  - survey_client: 5.0.0
  - systemtags: 1.23.0
  - text: 7.0.1
  - theming: 2.8.0
  - theming_customcss: 1.20.0
  - twofactor_backupcodes: 1.22.0
  - twofactor_webauthn: 2.7.0
  - updatenotification: 1.23.0
  - user_status: 1.13.0
  - viewer: 6.0.0
  - weather_status: 1.13.0
  - webhook_listeners: 1.5.0
  - workflow_script: 4.0.0
  - workflowengine: 2.15.0
Disabled:
  - app_api: 33.0.0 (installed 33.0.0)
  - files_antivirus: 6.3.0 (installed 6.3.0)
  - onlyoffice: 10.1.0 (installed 10.1.0)
  - richdocuments: 10.2.0 (installed 10.2.0)
  - sendent: 4.2.8 (installed 4.2.8)
  - suspicious_login: 11.0.0
  - testing: 1.23.0
  - twofactor_nextcloud_notification: 7.0.0 (installed 7.0.0)
  - twofactor_totp: 15.0.0 (installed 15.0.0-dev.0)
  - user_ldap: 1.24.0 (installed 1.24.0)
  - user_saml: 8.1.2 (installed 8.1.2)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

*Nextcloud 33.0.5.1
{"reqId":"ZTt5NV4Gka71tAGQBYNp","level":3,"time":"2026-06-19 16:03:26","remoteAddr":"xxx.xxx.xxx.xxx","user":"username","app":"webdav","method":"GET","url":"/remote.php/dav/files/username/A.pptx","scriptName":"/remote.php","message":"Bad Signature","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36","version":"33.0.5.1","exception":{"Exception":"OCP\\Encryption\\Exceptions\\GenericEncryptionException","Message":"Bad Signature","Code":0,"Trace":[{"file":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php","line":433,"function":"checkSignature","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Encryption.php","line":318,"function":"symmetricDecryptFileContent","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php","line":461,"function":"decrypt","class":"OCA\\Encryption\\Crypto\\Encryption","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php","line":260,"function":"readCache","class":"OC\\Files\\Stream\\Encryption","type":"->"},{"function":"stream_read","class":"OC\\Files\\Stream\\Encryption","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/icewind/streams/src/Wrapper.php","line":54,"function":"fread"},{"file":"/var/www/html/nextcloud/3rdparty/icewind/streams/src/CallbackWrapper.php","line":94,"function":"stream_read","class":"Icewind\\Streams\\Wrapper","type":"->"},{"function":"stream_read","class":"Icewind\\Streams\\CallbackWrapper","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php","line":108,"function":"stream_copy_to_stream"},{"file":"/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":490,"function":"sendResponse","class":"Sabre\\HTTP\\Sapi","type":"::"},{"file":"/var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/Server.php","line":212,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/html/nextcloud/apps/dav/lib/Server.php","line":428,"function":"start","class":"OCA\\DAV\\Connector\\Sabre\\Server","type":"->"},{"file":"/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php","line":25,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/html/nextcloud/remote.php","line":151,"args":["/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php","Line":457,"Hint":"\u4e0d\u6b63\u306a\u7f72\u540d","message":"Bad Signature","exception":"{\"class\":\"OCP\\Encryption\\Exceptions\\GenericEncryptionException\",\"message\":\"Bad Signature\",\"code\":0,\"file\":\"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php:457\",\"trace\":\"#0 /var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php(433): OCA\\Encryption\\Crypto\\Crypt->checkSignature()\\n#1 /var/www/html/nextcloud/apps/encryption/lib/Crypto/Encryption.php(318): OCA\\Encryption\\Crypto\\Crypt->symmetricDecryptFileContent()\\n#2 /var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php(461): OCA\\Encryption\\Crypto\\Encryption->decrypt()\\n#3 /var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php(260): OC\\Files\\Stream\\Encryption->readCache()\\n#4 [internal function]: OC\\Files\\Stream\\Encryption->stream_read()\\n#5 /var/www/html/nextcloud/3rdparty/icewind/streams/src/Wrapper.php(54): fread()\\n#6 /var/www/html/nextcloud/3rdparty/icewind/streams/src/CallbackWrapper.php(94): Icewind\\Streams\\Wrapper->stream_read()\\n#7 [internal function]: Icewind\\Streams\\CallbackWrapper->stream_read()\\n#8 /var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php(108): stream_copy_to_stream()\\n#9 /var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php(490): Sabre\\HTTP\\Sapi::sendResponse()\\n#10 /var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/Server.php(212): Sabre\\DAV\\Server->invokeMethod()\\n#11 /var/www/html/nextcloud/apps/dav/lib/Server.php(428): OCA\\DAV\\Connector\\Sabre\\Server->start()\\n#12 /var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php(25): OCA\\DAV\\Server->exec()\\n#13 /var/www/html/nextcloud/remote.php(151): require_once('...')\\n#14 {main}\"}","CustomMessage":"Bad Signature"}}
{"reqId":"ZTt5NV4Gka71tAGQBYNp","level":3,"time":"2026-06-19 16:03:26","remoteAddr":"xxx.xxx.xxx.xxx","user":"username","app":"no app in context","method":"GET","url":"/remote.php/dav/files/username/A.pptx","scriptName":"/remote.php","message":"Uncaught exception","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36","version":"33.0.5.1","exception":{"Exception":"OCP\\Encryption\\Exceptions\\GenericEncryptionException","Message":"Bad Signature","Code":0,"Trace":[{"file":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php","line":433,"function":"checkSignature","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Encryption.php","line":318,"function":"symmetricDecryptFileContent","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php","line":461,"function":"decrypt","class":"OCA\\Encryption\\Crypto\\Encryption","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php","line":260,"function":"readCache","class":"OC\\Files\\Stream\\Encryption","type":"->"},{"function":"stream_read","class":"OC\\Files\\Stream\\Encryption","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/icewind/streams/src/Wrapper.php","line":54,"function":"fread"},{"file":"/var/www/html/nextcloud/3rdparty/icewind/streams/src/CallbackWrapper.php","line":94,"function":"stream_read","class":"Icewind\\Streams\\Wrapper","type":"->"},{"function":"stream_read","class":"Icewind\\Streams\\CallbackWrapper","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php","line":108,"function":"stream_copy_to_stream"},{"file":"/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":490,"function":"sendResponse","class":"Sabre\\HTTP\\Sapi","type":"::"},{"file":"/var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/Server.php","line":212,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/html/nextcloud/apps/dav/lib/Server.php","line":428,"function":"start","class":"OCA\\DAV\\Connector\\Sabre\\Server","type":"->"},{"file":"/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php","line":25,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/html/nextcloud/remote.php","line":151,"args":["/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php","Line":457,"Hint":"\u4e0d\u6b63\u306a\u7f72\u540d","message":"Uncaught exception","exception":"{\"class\":\"OCP\\Encryption\\Exceptions\\GenericEncryptionException\",\"message\":\"Bad Signature\",\"code\":0,\"file\":\"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php:457\",\"trace\":\"#0 /var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php(433): OCA\\Encryption\\Crypto\\Crypt->checkSignature()\\n#1 /var/www/html/nextcloud/apps/encryption/lib/Crypto/Encryption.php(318): OCA\\Encryption\\Crypto\\Crypt->symmetricDecryptFileContent()\\n#2 /var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php(461): OCA\\Encryption\\Crypto\\Encryption->decrypt()\\n#3 /var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php(260): OC\\Files\\Stream\\Encryption->readCache()\\n#4 [internal function]: OC\\Files\\Stream\\Encryption->stream_read()\\n#5 /var/www/html/nextcloud/3rdparty/icewind/streams/src/Wrapper.php(54): fread()\\n#6 /var/www/html/nextcloud/3rdparty/icewind/streams/src/CallbackWrapper.php(94): Icewind\\Streams\\Wrapper->stream_read()\\n#7 [internal function]: Icewind\\Streams\\CallbackWrapper->stream_read()\\n#8 /var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php(108): stream_copy_to_stream()\\n#9 /var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php(490): Sabre\\HTTP\\Sapi::sendResponse()\\n#10 /var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/Server.php(212): Sabre\\DAV\\Server->invokeMethod()\\n#11 /var/www/html/nextcloud/apps/dav/lib/Server.php(428): OCA\\DAV\\Connector\\Sabre\\Server->start()\\n#12 /var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php(25): OCA\\DAV\\Server->exec()\\n#13 /var/www/html/nextcloud/remote.php(151): require_once('...')\\n#14 {main}\"}","CustomMessage":"Uncaught exception"}}

*Nextcloud 30.0.17.2
{"reqId":"IBpOAgWvMAG6GpjEqfeA","level":3,"time":"2026-06-19 15:39:32","remoteAddr":"xxx.xxx.xxx.xxx","user":"username","app":"webdav","method":"GET","url":"/remote.php/dav/files/username/A.pptx","message":"Bad Signature","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36","version":"30.0.17.2","exception":{"Exception":"OCP\\Encryption\\Exceptions\\GenericEncryptionException","Message":"Bad Signature","Code":0,"Trace":[{"file":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php","line":434,"function":"checkSignature","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Encryption.php","line":317,"function":"symmetricDecryptFileContent","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php","line":493,"function":"decrypt","class":"OCA\\Encryption\\Crypto\\Encryption","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php","line":292,"function":"readCache","class":"OC\\Files\\Stream\\Encryption","type":"->"},{"function":"stream_read","class":"OC\\Files\\Stream\\Encryption","type":"->"},{"file":"/var/www/html/nextcloud/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php","line":54,"function":"fread"},{"file":"/var/www/html/nextcloud/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php","line":94,"function":"stream_read","class":"Icewind\\Streams\\Wrapper","type":"->"},{"function":"stream_read","class":"Icewind\\Streams\\CallbackWrapper","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php","line":110,"function":"stream_copy_to_stream"},{"file":"/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":490,"function":"sendResponse","class":"Sabre\\HTTP\\Sapi","type":"::"},{"file":"/var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/Server.php","line":49,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/html/nextcloud/apps/dav/lib/Server.php","line":379,"function":"start","class":"OCA\\DAV\\Connector\\Sabre\\Server","type":"->"},{"file":"/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php","line":19,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/html/nextcloud/remote.php","line":146,"args":["/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/html/nextcloud/apps/encryption/lib/Crypto/Crypt.php","Line":458,"Hint":"\u4e0d\u6b63\u306a\u7f72\u540d","message":"Bad Signature","exception":{},"CustomMessage":"Bad Signature"}}

Additional info

No response

I monitored the results of the following SQL query while rolling back the file versions.

It appears that the version number for “encrypted” is gradually becoming corrupted.

SELECT fileid,path,encrypted FROM oc_filecache WHERE encrypted !=0 ORDER BY fileid;

Eventually, the encrypted version number for every file version becomes 1.

@come-nc

CC @come-nc

Possibly related: #40029

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[Bug]: Encrypted files become corrupted after restoring a version #61492

⚠️ This issue respects the following points: ⚠️

Bug description

Steps to reproduce

Expected behavior

Nextcloud Server version

Operating system

PHP engine version

Web server

Database engine version

Is this bug present after an update or on a fresh install?

Are you using the Nextcloud Server Encryption module?

What user-backends are you using?

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

[Bug]: Encrypted files become corrupted after restoring a version #61492

Description

⚠️ This issue respects the following points: ⚠️

Bug description

Steps to reproduce

Expected behavior

Nextcloud Server version

Operating system

PHP engine version

Web server

Database engine version

Is this bug present after an update or on a fresh install?

Are you using the Nextcloud Server Encryption module?

What user-backends are you using?

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

Activity

MasamitsuEndo commented on Jun 22, 2026

provokateurin commented on Jun 23, 2026

joshtrichards commented on Jun 24, 2026

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions