{"id":"UBUNTU-CVE-2025-4516","details":"There is an issue in CPython when using `bytes.decode(\"unicode_escape\", error=\"ignore|replace\")`. If you are not using the \"unicode_escape\" encoding or an error handler your usage is not affected. To work-around this issue you may stop using the error= handler and instead wrap the bytes.decode() call in a try-except catching the DecodeError.","modified":"2026-01-30T01:51:45.531256Z","published":"2025-05-15T14:15:00Z","related":["USN-7570-1"],"upstream":["CVE-2025-4516"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-4516"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-4516"},{"type":"REPORT","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/"},{"type":"REPORT","url":"https://github.com/python/cpython/pull/129648"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/5646648678295a44aa82636c6e92826651baf33a"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7570-1"}],"affected":[{"package":{"name":"python3.6","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/python3.6@3.6.9-1~18.04ubuntu1.13+esm5?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.9-1~18.04ubuntu1.13+esm5"}]}],"versions":["3.6.3-1ubuntu1","3.6.4~rc1-1","3.6.4~rc1-2","3.6.4-1","3.6.4-2","3.6.4-3build1","3.6.4-4","3.6.5~rc1-1","3.6.5-3","3.6.6-1~18.04","3.6.7-1~18.04","3.6.8-1~18.04.1","3.6.8-1~18.04.2","3.6.8-1~18.04.3","3.6.9-1~18.04","3.6.9-1~18.04ubuntu1","3.6.9-1~18.04ubuntu1.1","3.6.9-1~18.04ubuntu1.3","3.6.9-1~18.04ubuntu1.4","3.6.9-1~18.04ubuntu1.6","3.6.9-1~18.04ubuntu1.7","3.6.9-1~18.04ubuntu1.8","3.6.9-1~18.04ubuntu1.9","3.6.9-1~18.04ubuntu1.10","3.6.9-1~18.04ubuntu1.12","3.6.9-1~18.04ubuntu1.13","3.6.9-1~18.04ubuntu1.13+esm1","3.6.9-1~18.04ubuntu1.13+esm2","3.6.9-1~18.04ubuntu1.13+esm3","3.6.9-1~18.04ubuntu1.13+esm4"],"ecosystem_specific":{"availability":"Available 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