Attachment upload broken [Self hosted Bitwarden 2025.11.1]

[maxvisser]

Steps To Reproduce

1. Go to /#/vault
2. Click on +New
3. Choose Note
4. Create a Test note item
5. Edit item
6. Add attachments

Expected Result

File is being uploaded

Actual Result

Unexpected error accured

2025-11-26 10:34:10.115 +00:00 [Error] Unhandled exception
System.IO.IOException: Unexpected end of Stream, the content may have already been read by another component.
   at Microsoft.AspNetCore.WebUtilities.MultipartReaderStream.ReadAsync(Memory`1 buffer, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.WebUtilities.StreamHelperExtensions.DrainAsync(Stream stream, ArrayPool`1 bytePool, Nullable`1 limit, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.WebUtilities.MultipartReader.ReadNextSectionAsync(CancellationToken cancellationToken)
   at Bit.Api.Utilities.MultipartFormDataHelper.GetFileAsync(HttpRequest request, Func`2 callback) in /source/src/Api/Utilities/MultipartFormDataHelper.cs:line 109
   at Bit.Api.Vault.Controllers.CiphersController.PostFileForExistingAttachment(Guid id, String attachmentId) in /source/src/Api/Vault/Controllers/CiphersController.cs:line 1425
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Logged|12_1(ControllerActionInvoker invoker)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|26_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

Screenshots or Videos

Additional Context

• rebooted bitwarden already with ./bitwarden.sh stop and ./bitwarden.sh start

Build Version

2025.11.1+28469e0

Environment

Self-Hosted

Environment Details

• OS: Ubuntu 22.04.5 LTS
• Docker compose
• 2 cores, 4GB ram

Issue Tracking Info

• I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.

[bitwarden-bot]

Thank you for reporting this issue! We've added this to our internal tracking system.
ID: PM-28844
Link (for internal use): https://bitwarden.atlassian.net/browse/PM-28844

[pamperer562580892423]

Related: bitwarden/clients#17402

[NovaSilentium]

Hi there!

Thank you for your report, it seems like it is a duplicate of this one (bitwarden/clients#17402)

If you wish to add any further information/screenshots/recordings etc., please feel free to do so at any time in there - our engineering team will be happy to review these.

This issue will now be closed.

Thanks!

[pamperer562580892423]

@NovaSilentium I think you closed this as a duplicate of another and unrelated issue.

[NovaSilentium]

Thank you for catching that @pamperer562580892423

[maxvisser]

Thanks I did only search here in server and could not find an issue.