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Unscored USN-4754-2 0 CVEs

python2.7 regression

Published Feb 25, 2021 · Updated Jun 29, 2026

Summary

USN-4754-1 fixed a vulnerability in Python. The fix for CVE-2021-3177 introduced a
regression in Python 2.7. This update reverts the security fix pending further investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Python incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code
or cause a denial of service. (CVE-2020-27619, CVE-2021-3177)

Fixed packages 3

ReleasePackageFixed in
Ubuntu · 16.04 LTS 16.04:LTS python2.7 2.7.12-1ubuntu0~16.04.16
Ubuntu · 18.04 LTS 18.04:LTS python2.7 2.7.17-1~18.04ubuntu1.5
Ubuntu · Pro 14.04 LTS Pro:14.04:LTS python2.7 2.7.6-8ubuntu0.6+esm9

References

  • report
    https://launchpad.net/bugs/1916893