STINNER Victor added the comment:

> CVE-2012-6702 (issue 519)
> Resolve troublesome internal call to srand that was introduced with Expat 
> 2.1.0 when addressing CVE-2012-0876 (issue 496)

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-6702

Extract of Modules/pyexpat.c:
---
#if ((XML_MAJOR_VERSION >= 2) && (XML_MINOR_VERSION >= 1)) || 
defined(XML_HAS_SET_HASH_SALT)
    /* This feature was added upstream in libexpat 2.1.0.  Our expat copy
     * has a backport of this feature where we also define XML_HAS_SET_HASH_SALT
     * to indicate that we can still use it. */
    XML_SetHashSalt(self->itself,
                    (unsigned long)_Py_HashSecret.prefix);
#endif
---

Python 2.7, 3.5, 3.6 and 3.7 have this call at least (I didn't check other 
versions).

----------
nosy: +christian.heimes, haypo

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