Vulnerability · Published Nov 4, 2026 · Assigned by SNOWFLAKE
CVE-2026-121925Buffer overflow in SAML authentication post-back URL handling in libsnowflakeclient and Snowflake PHP PDO Driver
Medium 6.6
In plain English
A medium-severity stack buffer overflow in Snowflake Libsnowflakeclient from Snowflake. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Official description
A stack-based buffer overflow in libsnowflakeclient and the Snowflake PHP PDO Driver could, under specific conditions, result in memory corruption during SAML-based authentication. During a native SSO/SAML login flow, the affected drivers may have copied a value taken from the identity provider's HTML response into a fixed-size memory buffer without first validating the length of that value. An attacker who controlled or had compromised the configured identity provider — or who was able to redirect the SAML single sign-on endpoint to an attacker-controlled server — might have leveraged this by returning an oversized response, potentially resulting in a crash or, in specific circumstances, remote code execution within the context of the application running the library. The fix is available in libsnowflakeclient version 2.11.1 and Snowflake PHP PDO Driver version 4.3.0. Users must manually upgrade.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Snowflake | Snowflake PHP PDO Driver | 3.2.0 – before 4.3.0 |
| Snowflake | Snowflake Libsnowflakeclient | 2.1.0 – before 2.11.1 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H