Port, board and/or hardware

micropython unix port

MicroPython version

MicroPython v1.26.0-preview.391.g76f716a824.dirty on 2025-07-21; linux [GCC 12.2.0] version

Reproduction

try:
    dict()[:]
except Exception as e:
    exc = e
print(exc.value)

Expected behaviour

An exception is expected, and its value is safe to interact with

Observed behaviour

The exception's .value refers to the stacked temporary slice so the exact behavior is unpredictable. Often it shows as <> though sometimes print(exc) or dir(exc.value) will crash.

Additional Information

Discovered by fuzzing.

Code of Conduct

Yes, I agree