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Fix/underscore account hostname #2898

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Fix/underscore account hostname #2898

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67b0c22
fix(hostname): replace underscores with hyphens in account identifier
Pazuzzu Jun 1, 2026
b8677c8
chore: Add changelog entry
Pazuzzu Jun 1, 2026
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3 changes: 3 additions & 0 deletions DESCRIPTION.md
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Expand Up @@ -7,6 +7,9 @@ https://docs.snowflake.com/
Source code is also available at: https://github.com/snowflakedb/snowflake-connector-python

# Release Notes
- v4.6.1(TBD)
- Fixed SSL hostname mismatch when using the async connector with account names containing underscores (#1839).

- v4.6.0(May 28,2026)
- Dropped support for Python 3.9. The minimum supported version is now Python 3.10.
- Fixed sdist to only install the minicore binary matching the current platform (SNOW-3526469). Previous 4.x releases copied every platform's minicore `.so`/`.dylib`/`.dll` into the install prefix, breaking downstream packagers (e.g. Homebrew) whose audits reject foreign-arch binaries.
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2 changes: 2 additions & 0 deletions src/snowflake/connector/util_text.py
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Expand Up @@ -306,6 +306,8 @@ def _concatenate_statements(

def construct_hostname(region: str | None, account: str) -> str:
"""Constructs hostname from region and account."""
# RFC 952: underscores are not valid in hostnames
account = account.replace("_", "-")

def _is_china_region(r: str) -> bool:
# This is consistent with the Go driver:
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