fix: reject bool values in ConnectionConfig int validators (Fixes #2076)

[rtmalikian]

Fixes #2076

Problem

In weaviate/config.py, the ConnectionConfig.__post_init__ method validates that session_pool_connections, session_pool_maxsize, session_pool_max_retries, and session_pool_timeout are int types using isinstance(x, int).

Since bool is a subclass of int in Python, isinstance(True, int) returns True. This means True and False silently pass validation for these fields:

from weaviate.config import ConnectionConfig
config = ConnectionConfig(session_pool_connections=True)  # No error!
config.session_pool_connections  # True (not a valid connection count)

The same pattern exists in weaviate/util.py's check_number() helper function.

Solution

Add and not isinstance(x, bool) guard to all four validators in ConnectionConfig.__post_init__ and to the check_number() helper in util.py.

Verification

# Before fix: True passes validation
ConnectionConfig(session_pool_connections=True)  # No error

# After fix: True is rejected
ConnectionConfig(session_pool_connections=True)  # TypeError

# Normal int values still work
ConnectionConfig(session_pool_connections=20)  # OK

Changelog

Date	Change	Author
2026-06-20	Add bool guard to ConnectionConfig int validators and check_number()	rtmalikian

Files Changed

• weaviate/config.py — Add or isinstance(x, bool) to all 4 int validators
• weaviate/util.py — Add bool guard to check_number() helper

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About the Author: Raphael Malikian — Clinical AI Solutions Architect. I specialise in building and fixing AI/ML systems for healthcare, including vector databases, RAG pipelines, and clinical NLP. If you need help with your project or think I can add value to your organisation, feel free to reach out — I'd love to connect.

📧 rtmalikian@gmail.com
🔗 GitHub: https://github.com/rtmalikian
🔗 LinkedIn: http://www.linkedin.com/in/raphael-t-malikian-mbbs-bsc-hons-71075436a

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Disclosure: This code was developed with assistance from mimo-v2.5-pro (Xiaomi) via Hermes Agent (Nous Research). All changes were reviewed, tested against the actual codebase, and verified for correctness.

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

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[rtmalikian]

I agree with the CLA. Thank you!