Snowflake Connector for Python improperly verifies TLS hostnames
Improper TLS hostname verification in Snowflake Connector for Python versions prior to 4.7.1 and 3.18.1 may have allowed a network-positioned attacker to bypass certificate hostname validation on HTTPS connections made by the connector. An attacker with on-path network access could exploit this by intercepting or redirecting network traffic and presenting a certificate signed by any trusted CA for any domain, causing the connector to accept connections without validating that the certificate matched the requested hostname. Successful exploitation requires an on-path traffic interception capability (e.g. ARP/DNS poisoning, rogue access point, BGP hijacking, or malicious proxy/exit node). This vulnerability may have exposed credentials, query data, and staged file contents to interception and tampering, and may have enabled the attacker to issue arbitrary SQL within the context of the victim's connector session. Impact is limited by the privileges of the affected Snowflake role. The fix is available in Snowflake Connector for Python versions 4.7.1 and 3.18.1. Users must manually upgrade.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | snowflake-connector-python | < 3.18.1, >= 4.0.0, < 4.7.1 | 3.18.1, 4.7.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-15925
- https://github.com/snowflakedb/snowflake-connector-python/commit/8969d6dc027092ee868965db022478b6c0fa40a1
- https://github.com/snowflakedb/snowflake-connector-python
- https://github.com/snowflakedb/snowflake-connector-python/releases/tag/v3.18.1
- https://github.com/snowflakedb/snowflake-connector-python/releases/tag/v4.7.1
- https://pypi.org/project/snowflake-connector-python
- https://github.com/advisories/GHSA-5cc2-282f-jjq2
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-297- Platform
- Python (PyPI)
- Package
snowflake-connector-python- Disclosed
- 16.07.2026
- Updated
- 11.10.2026 15:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-3920 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-5cc2-282f-jjq2 - CC BY 4.0
Vulnerability history: snowflake-connector-python
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 11.2022 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
- Medium 5
Disclosures per year
- 2022: 1
- 2023: 1
- 2024: 1
- 2025: 3
- 2026: 2
-
Snowflake Connector for Python improperly verifies TLS hostnames this entry
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