akkadotnet/akka.net 1.5.55

Akka.NET v1.5.55

on GitHub

1.5.55 October 26th, 2025

Akka.NET v1.5.55 is a patch release containing important stability and security improvements for Akka.Remote.

Akka.Remote Stability Improvements:

• Akka.Remote: harden EndpointWriter against serialization failures - Fixes issue #7922 by hardening the EndpointWriter against a broader range of potential serialization failures, improving overall remoting stability.

Akka.Remote Security Improvements:

• Custom certificate validation with single execution path - fixes mTLS asymmetry bug - Fixes issue #7914 by introducing programmatic certificate validation helpers through the new CertificateValidation factory class. This release adds 7 new validation helper methods including ValidateChain(), ValidateHostname(), PinnedCertificate(), ValidateSubject(), ValidateIssuer(), Combine(), and ChainPlusThen(). The update also fixes an mTLS asymmetry bug where server-side hostname validation was not being applied consistently with client-side validation, all while maintaining full backward compatibility with existing HOCON-based validation.

• Fix DotNettySslSetup being ignored when HOCON has valid SSL config - Fixes issue #7917 where programmatic DotNettySslSetup settings were incorrectly being overridden by HOCON configuration. Programmatic configuration now correctly takes precedence over HOCON defaults as intended.

1 contributor since release 1.5.54

Changes:

• 2492bdb Prepare v1.5.55 release (#7926)
• 2dc1c57 Akka.Remote: harden EndpointWriter against serialization failures (#7923) (#7925) [ #7922 ]
• 98c25d1 feat(remote): custom certificate validation with single execution path - fixes mTLS asymmetry bug (#7915) (#7921) [ #7914 ]
• 1e8d606 Fix DotNettySslSetup being ignored when HOCON has valid SSL config (#7918) (#7919) [ #7917 ]
• 77ba03c Prepare v1.5.54 release (#7913)

This list of changes was auto generated.