Common Weakness Enumeration

    CWE Definition / CWE-134

    CWE-134: Use of Externally-Controlled Format String

    The product uses a function that accepts a format string as an argument, but the format string originates from an external source.

    Published:19 Jul 2006
    Organization:MITRE
    Modified:11 Dec 2025

    Related Weakness

    CWE-668: Exposure of Resource to Wrong Sphere

    CWE-668: Exposure of Resource to Wrong Sphere

    CWE-123: Write-what-where Condition

    CWE-20: Improper Input Validation