Improper TLS Hostname Verification in Snowflake Connector for Python

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-15925
StatePUBLISHED
AssignerSNOWFLAKE
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 07:16:47 UTC
Updated2026-07-16 13:47:43 UTC
DescriptionImproper 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.

Risk And Classification

Primary CVSS: v4.0 9.2 CRITICAL from 412d305a-227d-44f9-a262-a31ba44f2aea

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.001770000 probability, percentile 0.074410000 (date 2026-07-20)

Problem Types: CWE-297 | CWE-297 Improper Validation of Certificate with Host Mismatch

VersionSourceTypeScoreSeverityVector
4.0412d305a-227d-44f9-a262-a31ba44f2aeaSecondary9.2CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS9.2CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Snowflake Snowflake Connector For Python affected 3.17.4 3.18.1 semver Not specified
CNA Snowflake Snowflake Connector For Python affected 4.0.0 4.7.1 semver Not specified

References

ReferenceSourceLinkTags
github.com/snowflakedb/snowflake-connector-python/releases/tag/v4.7.1 412d305a-227d-44f9-a262-a31ba44f2aea github.com
github.com/snowflakedb/snowflake-connector-python/releases/tag/v3.18.1 412d305a-227d-44f9-a262-a31ba44f2aea github.com
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