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  4. CVE 2026 121925 buffer overflow in saml authentication post back
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Back to active CVEs
Medium · CVSS 6.6CVE-2026-121925

Buffer overflow in SAML authentication post-back URL handling in libsnowflakeclient and Snowflake PHP PDO DriverCVE-2026-121925

Answer in brief

CVE-2026-121925 records a Medium severity (CVSS 6.6) vulnerability in Buffer overflow in SAML authentication post-back URL handling in libsnowflakeclient and Snowflake PHP PDO Driver. The current sources do not mark it as known exploited. The current feed maps Snowflake/Snowflake Libsnowflakeclient (generic), Snowflake/Snowflake PHP PDO Driver (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 4, 2026Updated Nov 4, 2026Source checked Nov 4, 2026First seen by HOL Nov 4, 2026Material review Nov 4, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.6
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Snowflake/Snowflake Libsnowflakeclient (generic), Snowflake/Snowflake PHP PDO Driver (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Snowflake/Snowflake Libsnowflakeclientgeneric>=2.1.0 <2.11.12.11.1
Snowflake/Snowflake PHP PDO Drivergeneric>=3.2.0 <4.3.04.3.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Snowflake/Snowflake Libsnowflakeclient, Snowflake/Snowflake PHP PDO Driver.
  2. 2Review the reported fix. Update Snowflake/Snowflake Libsnowflakeclient to 2.11.1; Snowflake/Snowflake PHP PDO Driver to 4.3.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 4, 2026

Sources and claim methodology

  • Source referencedocs.snowflake.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Missing origin validation for the externalbrowser authenticator callback in multiple Snowflake client driversSame snowflake/snowflake libsnowflakeclient package
  • Apache OpenOffice: Stack overflow in CFF hint handlingAlso CWE-121

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Nov 4, 2026
References
2 linked sources
Open source record