HIGH 7.8 Microsoft
CVE-2018-20225
An issue was discovered in pip (all versions) because it installs the version with the highest version number, even if the user had intended to obtain a private package from a private index. This only affects use of the --extra-index-url option, and exploitation requires that the package does not already exist in the public index (and thus the attacker can put the package there with an arbitrary version number). NOTE: it has been reported that this is intended functionality and the user is responsible for using --extra-index-url securely
Microsoft Security Update 2026-Aug: An issue was discovered in pip (all versions) because it installs the version with the highest version number, even if the user had intended to obtain a private package from a private index. This only affects use of the --extra-index-url option, and exploitation requires that the package does not already exist in the public index (and thus the attacker can put the package there with an arbitrary version number). NOTE: it has been reported that this is intended functionality and the user is responsible for using --extra-index-url securely
Affected Products
- azl3 python-pip 24.2-2 on Azure Linux 3.0
- cm1 python-pip 19.2-2 on CBL Mariner 1.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-20225
- https://nvd.nist.gov/vuln/detail/CVE-2018-20225
This high severity vulnerability with a CVSS score of 7.8 was published on 2026-08-06 via Microsoft. Affected: azl3 python-pip 24.2-2 on Azure Linux 3.0, cm1 python-pip 19.2-2 on CBL Mariner 1.0.
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