After upgrading from pgAdmin 4 v9.15 to v9.16 Pgadmin fails with "Could not contact Server"

[anitagraham]

Please note that security bugs or issues should be reported to security@pgadmin.org.

Describe the bug
After updating from v9.15 to v9.16, opening pgAdmin takes a long time and eventually fails with The pgAdmin 4 server could not be contacted:, and a window of trace information - see Error message section.

pgAdmin 4 9.15 was working as usual.

Error message
The key message seems to be

'/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' not valid for use in process: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.)

The full trace

 File "/Applications/pgAdmin 4.app/Contents/Resources/web/pgAdmin4.py", line 38, in <module>
    import config
  File "/Applications/pgAdmin 4.app/Contents/Resources/web/config.py", line 33, in <module>
    from pgadmin.utils import env, IS_WIN, fs_short_path
  File "/Applications/pgAdmin 4.app/Contents/Resources/web/pgadmin/__init__.py", line 46, in <module>
    from pgadmin.utils.session import create_session_interface, pga_unauthorised
  File "/Applications/pgAdmin 4.app/Contents/Resources/web/pgadmin/utils/session.py", line 35, in <module>
    from cryptography.fernet import Fernet, InvalidToken
  File "/Applications/pgAdmin 4.app/Contents/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/cryptography/fernet.py", line 15, in <module>
    from cryptography.exceptions import InvalidSignature
  File "/Applications/pgAdmin 4.app/Contents/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/cryptography/exceptions.py", line 9, in <module>
    from cryptography.hazmat.bindings._rust import exceptions as rust_exceptions
ImportError: dlopen(/Applications/pgAdmin 4.app/Contents/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/cryptography/hazmat/bindings/_rust.abi3.so, 0x0002): Library not loaded: /usr/local/opt/openssl@3/lib/libssl.3.dylib
  Referenced from: <7B82453A-6A52-3497-ADC5-B6AE67F1C00B> /Applications/pgAdmin 4.app/Contents/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/cryptography/hazmat/bindings/_rust.abi3.so
  Reason: tried: '/usr/local/opt/openssl@3/lib/libssl.3.dylib' (code signature in <D5103B82-540A-3D04-9B22-8E453EC24EBB> '/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' not valid for use in process: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.), '/System/Volumes/Preboot/Cryptexes/OS/usr/local/opt/openssl@3/lib/libssl.3.dylib' (no such file), '/usr/local/opt/openssl@3/lib/libssl.3.dylib' (code signature in <D5103B82-540A-3D04-9B22-8E453EC24EBB> '/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' not valid for use in process: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.), '/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' (code signature in <D5103B82-540A-3D04-9B22-8E453EC24EBB> '/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' not valid for use in process: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.), '/System/Volumes/Preboot/Cryptexes/OS/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' (no such file), '/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' (code signature in <D5103B82-540A-3D04-9B22-8E453EC24EBB> '/usr/local/Cellar/openssl@3/3.5.2/lib/libssl.3.dylib' not valid for use in process: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.)

Desktop (please complete the following information):
ProductName: macOS
ProductVersion: 15.7.7
BuildVersion: 24G720

Question
Is openssl v3 the problem? What are the implications of upgrading openssl to v4?

thanks, Anita Graham