{"id":"USN-4754-2","aliases":[],"status":"published","title":"python2.7 regression","description":"USN-4754-1 fixed a vulnerability in Python. The fix for CVE-2021-3177 introduced a\nregression in Python 2.7. This update reverts the security fix pending further investigation.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that Python incorrectly handled certain inputs.\n An attacker could possibly use this issue to execute arbitrary code\n or cause a denial of service. (CVE-2020-27619, CVE-2021-3177)","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-02-25T18:54:00Z","modified":"2026-06-29T13:48:10Z","fixes":[{"ecosystem":"Ubuntu:Pro:14.04:LTS","package":"python2.7","fixed_in":["2.7.6-8ubuntu0.6+esm9"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"python2.7","fixed_in":["2.7.12-1ubuntu0~16.04.16"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"python2.7","fixed_in":["2.7.17-1~18.04ubuntu1.5"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"python2.7","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.6-8ubuntu0.6+esm9"}]}],"versions":["2.7.5-8ubuntu3","2.7.5-8ubuntu4","2.7.6-2","2.7.6-2ubuntu1","2.7.6-3","2.7.6-3ubuntu1","2.7.6-4","2.7.6-4ubuntu1","2.7.6-5","2.7.6-7","2.7.6-8","2.7.6-8ubuntu0.2","2.7.6-8ubuntu0.3","2.7.6-8ubuntu0.4","2.7.6-8ubuntu0.5","2.7.6-8ubuntu0.6+esm2","2.7.6-8ubuntu0.6+esm3","2.7.6-8ubuntu0.6+esm5","2.7.6-8ubuntu0.6+esm6","2.7.6-8ubuntu0.6+esm7","2.7.6-8ubuntu0.6+esm8"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"python2.7","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.12-1ubuntu0~16.04.16"}]}],"versions":["2.7.10-4ubuntu1","2.7.10-4ubuntu2","2.7.11-2","2.7.11-3","2.7.11-4","2.7.11-6","2.7.11-7","2.7.11-7ubuntu1","2.7.12-1~16.04","2.7.12-1ubuntu0~16.04.1","2.7.12-1ubuntu0~16.04.2","2.7.12-1ubuntu0~16.04.3","2.7.12-1ubuntu0~16.04.4","2.7.12-1ubuntu0~16.04.8","2.7.12-1ubuntu0~16.04.9","2.7.12-1ubuntu0~16.04.11","2.7.12-1ubuntu0~16.04.12","2.7.12-1ubuntu0~16.04.13","2.7.12-1ubuntu0~16.04.14"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"python2.7","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.17-1~18.04ubuntu1.5"}]}],"versions":["2.7.14-2ubuntu2","2.7.14-4","2.7.14-6","2.7.14-7","2.7.14-8","2.7.15~rc1-1","2.7.15~rc1-1ubuntu0.1","2.7.15-4ubuntu4~18.04","2.7.15-4ubuntu4~18.04.1","2.7.15-4ubuntu4~18.04.2","2.7.17-1~18.04","2.7.17-1~18.04ubuntu1","2.7.17-1~18.04ubuntu1.1","2.7.17-1~18.04ubuntu1.2","2.7.17-1~18.04ubuntu1.3"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-4754-2","tags":["advisory"]},{"url":"https://launchpad.net/bugs/1916893","tags":["report"]}],"sources":{"osv":[{"id":"USN-4754-2","title":"python2.7 regression","description":"USN-4754-1 fixed a vulnerability in Python. The fix for CVE-2021-3177 introduced a\nregression in Python 2.7. This update reverts the security fix pending further investigation.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that Python incorrectly handled certain inputs.\n An attacker could possibly use this issue to execute arbitrary code\n or cause a denial of service. (CVE-2020-27619, CVE-2021-3177)\n","status":"published","published":"2021-02-25T18:54:00Z","modified":"2026-06-29T13:48:10.272463037Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}