Vulnerability · Published Jul 16, 2026 · Assigned by SNOWFLAKE
CVE-2026-15925Improper TLS Hostname Verification in Snowflake Connector for Python
Critical 9.2
In plain English
A critical-severity security flaw in Snowflake Connector for Python from Snowflake. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | snowflake-connector-python | 3.18.1 | GHSA-5cc2-282f-jjq2 |
| PyPI | snowflake-connector-python | 4.7.1 | GHSA-5cc2-282f-jjq2 |
| PyPI | snowflake-connector-python | 3.18.1, 4.7.1 | PYSEC-2026-3920 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Snowflake | Snowflake Connector for Python | 3.17.4 – before 3.18.14.0.0 – before 4.7.1 |
Weakness: CWE-297 · 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