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Published: 5 November 2019

The mirroring support (-M, --use-mirrors) in Python Pip before 1.5 uses insecure DNS querying and authenticity checks which allows attackers to perform man-in-the-middle attacks.


This will probably require some ecosystem changes in the Python world
to support authenticated PIP downloads.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
artful Not vulnerable

bionic Not vulnerable

lucid Ignored
(end of life, was deferred)
precise Ignored
(end of life)
quantal Ignored
(end of life, was deferred)
raring Ignored
(end of life, was deferred)
saucy Ignored
(end of life, was deferred)
trusty Not vulnerable
Released (1.3.1-1)
utopic Ignored
(end of life, was deferred)
vivid Ignored
(end of life, was deferred)
wily Ignored
(end of life)
xenial Not vulnerable
yakkety Ignored
(end of life)
zesty Ignored
(end of life)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N