CVE-2020-18898: 
Python vulnerability analysis and mitigation

CVE-2020-18898 is a security vulnerability discovered in Exiv2 version 0.27. The vulnerability was identified as a stack exhaustion issue in the printIFDStructure function that allows remote attackers to cause a denial of service (DOS) via a crafted file (NVD).

The vulnerability is classified as a stack exhaustion problem caused by uncontrolled recursion in the printIFDStructure function within image.cpp. When processing certain crafted files, the function makes recursive calls to itself without proper depth control, leading to stack overflow. The vulnerability has been assigned a CVSS v3.1 base score of 6.5 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H (NVD).

The primary impact of this vulnerability is the potential for denial of service attacks. When exploited, the vulnerability can cause rapid consumption of stack memory resources, eventually leading to program crashes or system instability. This affects the availability of the Exiv2 service (CWE).

According to Ubuntu security advisories, this vulnerability only affects debug builds and is not present in standard Ubuntu binaries. For affected systems, implementing proper recursion depth control and stack size limitations in the printIFDStructure function would mitigate the issue (Ubuntu).