This bug is present in gdImageCreateFromXbm method of ext/gd/libgd/gd_xbm.c file. This method contains below mentioned lines. ```c ... unsigned int b; ... sscanf(h, "%x", &b); for (bit = 1; bit <= max_bit; bit = bit << 1) { gdImageSetPixel(im, x++, y, (b & bit) ? 1 : 0); ... ``` So when sscanf method is not able to read a hex value, "b" variable will contain uninitialized data. Bug Report : https://bugs.php.net/bug.php?id=77973 PHP Version : 7.1.29 CVE-ID : [2019-11038](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11038) ## Impact Uninitialized data may leak data from stack memory.

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CVE-2019-11038 LOW

When using the gdImageCreateFromXbm() function in the GD Graphics Library (aka LibGD) 2.2.5, as used in the PHP GD extension in PHP versions 7.1.x below 7.1.30, 7.2.x below 7.2.19 and 7.3.x below 7.3.6, it is possible to supply data that will cause the function to use the value of uninitialized …

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