Mumble has been released in version 1.5.939.

Mumble is an open-source, low-latency, high-quality voice chat application popular among gamers.

The fifth patch release of the 1.5.x series brings important bug fixes, especially for server administrators, including fixes for possible crashes and denial-of-service issues on the server.

Client:

• Fixed rare library loading issue (#7324)
• Fixed skipping UDP ping when TCP mode is forced (#7302)

Server:

• Fixed preventing data flow to/from unauthenticated connections (#7398)
• Fixed password generator not utilizing the complete alphabet (#7313)
• Fixed various server-side issues potentially causing crashes or denial-of-service (#7398)

Both (Client & Server):

• Fixed IP netmask handling (#7283)
• Fixed Network Quality of Service setting with IPv6 (#7345)
• Fixed versioning scheme on Windows 10 (21H1) or greater (#7263)

Miscellaneous:

• Fixed various build issues across toolchain configurations

Known Issues:

• Overlay blocked by CS:GO Trusted Mode

Source: Mumble Blog