---
title: "CVE-2026-15925: Snowflake Connector for Python improperly verifies TLS hostnames"
url: https://erroneo.us/security/cve/CVE-2026-15925/
description: "CVE-2026-15925 (snowflake-connector-python (PyPI)): Improper TLS hostname verification in Snowflake Connector for Python versions prior to 4.7.1 and 3.18.1…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-16
date_modified: 2026-08-31
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-15925"
kev: false
cvss: 9.2
epss: 0.00288
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-15925: Snowflake Connector for Python improperly verifies TLS hostnames

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.3% , percentile 20: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 20% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes snowflake-connector-python (PyPI) < 3.18.1, fixed in 3.18.1 ; snowflake-connector-python (PyPI) >= 4.0.0, < 4.7.1, fixed in 4.7.1 . Check your lockfile, including transitive dependencies.

## What it is

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

- PyPI `snowflake-connector-python` < 3.18.1 → fixed: 3.18.1
- PyPI `snowflake-connector-python` >= 4.0.0, < 4.7.1 → fixed: 4.7.1

## Affected products (CVE record)

- Snowflake Snowflake Connector for Python: 3.17.4 < 3.18.1, 4.0.0 < 4.7.1

## Severity

- SNOWFLAKE CVSS 4.0: 9.2 `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`
- GitHub CVSS 4.0: 9.2 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.29% probability of exploitation activity in the next 30 days; percentile 20.

## Sources

- [GitHub Advisory GHSA-5cc2-282f-jjq2](https://github.com/advisories/GHSA-5cc2-282f-jjq2)
- [CVE.org record CVE-2026-15925](https://www.cve.org/CVERecord?id=CVE-2026-15925)
- [NVD entry CVE-2026-15925](https://nvd.nist.gov/vuln/detail/CVE-2026-15925)
- [Snowflake Connector for Python 3.18.1 Release Notes](https://github.com/snowflakedb/snowflake-connector-python/releases/tag/v3.18.1)
- [Snowflake Connector for Python 4.7.1 Release Notes](https://github.com/snowflakedb/snowflake-connector-python/releases/tag/v4.7.1)
- [github.com](https://github.com/snowflakedb/snowflake-connector-python/commit/8969d6dc027092ee868965db022478b6c0fa40a1)

---
Source page: https://erroneo.us/security/cve/CVE-2026-15925/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt