Snowflake Libsnowflakeclient/PHP PDO Driver stack-based overflow

Summaryinfo

A vulnerability classified as very critical was found in Snowflake Libsnowflakeclient and PHP PDO Driver. Affected by this vulnerability is an unknown functionality. The manipulation results in stack-based overflow. This vulnerability is identified as CVE-2026-121925. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as very critical has been found in Snowflake Libsnowflakeclient and PHP PDO Driver (version unknown). Affected is an unknown function. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at docs.snowflake.com. This vulnerability is traded as CVE-2026-121925 since 11/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation needs additional levels of successful authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/04/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Hardware Driver Software

Vendor

• Snowflake

Name

• Libsnowflakeclient
• PHP PDO Driver

CPE 2.3info

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CPE 2.2info

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