CVE-2026-15925 in Connector for Python
Summary
by MITRE • 07/16/2026
Improper TLS hostname verification in Snowflake Connector for Python versions prior to 4.7.1 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 version 4.7.1. Users must manually upgrade.
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Analysis
by VulDB Data Team • 07/16/2026
The vulnerability described represents a critical flaw in the Snowflake Connector for Python that undermines the fundamental security mechanism of TLS hostname verification. This weakness exists in versions prior to 4.7.1 and creates a pathway for man-in-the-middle attacks where an adversary positioned within the network traffic flow can bypass certificate validation checks. The flaw specifically targets the hostname validation process that should ensure certificates presented by servers match the domain name being accessed, creating a significant security gap that allows attackers to present fraudulent certificates signed by trusted certificate authorities while maintaining the illusion of legitimate connections.
The technical implementation of this vulnerability stems from improper handling of SSL/TLS certificate validation within the Python connector library. When establishing HTTPS connections to Snowflake services, the connector should verify that the server's certificate contains a subject alternative name or common name that matches the target hostname. However, due to the flawed implementation, the connector fails to perform this critical validation step, allowing connections to proceed even when the certificate does not properly authenticate the server's identity. This issue directly relates to CWE-295 which specifically addresses improper certificate validation and weak TLS implementations in network communications.
The operational impact of this vulnerability extends beyond simple data interception to potentially enable complete session compromise and unauthorized access to database resources. An attacker with on-path network capabilities can exploit this weakness by intercepting traffic and presenting certificates that appear legitimate to the connector while actually being controlled by the malicious actor. The consequences include potential exposure of sensitive credentials stored within the connector's authentication context, interception and modification of query data during transmission, and access to staged file contents that may contain confidential information. Furthermore, successful exploitation could allow attackers to execute arbitrary SQL commands within the privileges of the victim's Snowflake role, effectively enabling them to perform unauthorized database operations and potentially exfiltrate or manipulate data.
The attack vectors required for successful exploitation are limited to scenarios where the attacker maintains network position within the communication path between the connector and the Snowflake service. This includes techniques such as ARP poisoning, DNS hijacking, rogue access points, BGP route hijacking, or compromising proxy servers that act as exit nodes in the network path. The vulnerability's impact is directly proportional to the privileges assigned to the Snowflake role used by the connector, meaning that attackers with elevated privileges could cause significantly more damage than those with restricted access rights. This aligns with ATT&CK framework concepts related to credential access and defense evasion techniques where attackers leverage weakened authentication mechanisms to maintain persistent access to target systems.
Security professionals must understand that this vulnerability represents a failure in the principle of least privilege enforcement within the connector's security implementation, as it allows attackers to bypass essential transport layer security measures. The remediation strategy requires immediate manual upgrade to Snowflake Connector for Python version 4.7.1, as automatic updates are not available for this specific component. Organizations should conduct comprehensive inventory checks to identify all systems utilizing affected connector versions and implement proper network monitoring to detect potential exploitation attempts. Additionally, the vulnerability highlights the importance of maintaining current security patches and implementing robust certificate pinning strategies where appropriate to provide additional layers of protection against similar issues in the future. The fix addresses the core validation logic that was previously bypassed, ensuring that hostname verification functions correctly according to established TLS security standards and preventing the exploitation scenario described in the original vulnerability report.