Medium severityOSV Advisory· Published May 15, 2025· Updated Apr 15, 2026
CVE-2025-4516
CVE-2025-4516
Description
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.
Affected products
1- Range: v0.9.8, v0.9.9, v1.0.1, …
Patches
7ab9893c4060973b3040f59244398b788ffc16279eb8c076d69b4387f78f48d35fd1b34939f69a58623bdVulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
12- www.openwall.com/lists/oss-security/2025/05/16/4nvd
- www.openwall.com/lists/oss-security/2025/05/19/1nvd
- github.com/python/cpython/commit/4398b788ffc1f954a2c552da285477d42a571292nvd
- github.com/python/cpython/commit/6279eb8c076d89d3739a6edb393e43c7929b429dnvd
- github.com/python/cpython/commit/69b4387f78f413e8c47572a85b3478c47eba8142nvd
- github.com/python/cpython/commit/73b3040f592436385007918887b7e2132aa8431fnvd
- github.com/python/cpython/commit/8d35fd1b34935221aff23a1ab69a429dd156be77nvd
- github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8envd
- github.com/python/cpython/commit/ab9893c40609935e0d40a6d2a7307ea51aec598bnvd
- github.com/python/cpython/issues/133767nvd
- github.com/python/cpython/pull/129648nvd
- mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/nvd
News mentions
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