Language: Java
Label: vulnerable
CWE: CWE-74 \u2014 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Code:
  public void setFormatParams() throws Exception {
    assertPlotParam("yformat", "%25.2f");
    assertPlotParam("y2format", "%25.2f");
    assertPlotParam("xformat", "%25.2f");
    assertPlotParam("yformat", "%253.0em");
    assertPlotParam("yformat", "%253.0em%25%25");
    assertPlotParam("yformat", "%25.2f seconds");
    assertPlotParam("yformat", "%25.0f ms");
    assertInvalidPlotParam("yformat", "%252.[33:system");
  }