{"id":"CVE-2025-4516","title":"There is an issue in CPython when using `bytes.decode(\"unicode_escape\", error=\"ignore|replace\")`","summary":"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 u…","severity":"none","cwe":["CWE-416"],"published":"2025-05-15","updated":"2026-07-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-4516","references":[{"url":"https://github.com/python/cpython/commit/4398b788ffc1f954a2c552da285477d42a571292","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/6279eb8c076d89d3739a6edb393e43c7929b429d","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/69b4387f78f413e8c47572a85b3478c47eba8142","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/73b3040f592436385007918887b7e2132aa8431f","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/8d35fd1b34935221aff23a1ab69a429dd156be77","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/ab9893c40609935e0d40a6d2a7307ea51aec598b","label":"cna@python.org"},{"url":"https://github.com/python/cpython/issues/133767","label":"cna@python.org"},{"url":"https://github.com/python/cpython/pull/129648","label":"cna@python.org"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/","label":"cna@python.org"},{"url":"http://www.openwall.com/lists/oss-security/2025/05/16/4","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2025/05/19/1","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00216,"epssPercentile":0.12281,"ingestedAt":"2026-07-31T06:58:50.652Z","slug":"CVE-2025-4516","body":"## Overview\n\nThere 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}