{"id":"BIT-python-2025-4516","summary":"Use-after-free in \"unicode_escape\" decoder with error handler","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.","aliases":["BIT-libpython-2025-4516","BIT-python-min-2025-4516","CVE-2025-4516","PSF-2025-4"],"modified":"2025-08-11T15:13:31.228474Z","published":"2025-06-20T09:48:08.494Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/05/16/4"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/05/19/1"},{"type":"WEB","url":"https://github.com/python/cpython/commit/4398b788ffc1f954a2c552da285477d42a571292"},{"type":"WEB","url":"https://github.com/python/cpython/commit/6279eb8c076d89d3739a6edb393e43c7929b429d"},{"type":"WEB","url":"https://github.com/python/cpython/commit/69b4387f78f413e8c47572a85b3478c47eba8142"},{"type":"WEB","url":"https://github.com/python/cpython/commit/73b3040f592436385007918887b7e2132aa8431f"},{"type":"WEB","url":"https://github.com/python/cpython/commit/8d35fd1b34935221aff23a1ab69a429dd156be77"},{"type":"WEB","url":"https://github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e"},{"type":"WEB","url":"https://github.com/python/cpython/commit/ab9893c40609935e0d40a6d2a7307ea51aec598b"},{"type":"WEB","url":"https://github.com/python/cpython/issues/133767"},{"type":"WEB","url":"https://github.com/python/cpython/pull/129648"},{"type":"WEB","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-4516"}],"affected":[{"package":{"name":"python","ecosystem":"Bitnami","purl":"pkg:bitnami/python"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.9.23"},{"introduced":"3.10.0"},{"fixed":"3.10.18"},{"introduced":"3.11.0"},{"fixed":"3.11.13"},{"introduced":"3.12.0"},{"fixed":"3.12.11"},{"introduced":"3.13.0"},{"fixed":"3.13.4"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/python/BIT-python-2025-4516.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.7.3"}