CVE-2025-4516 – CPython Bytes Decode Unicode Escape Vulnerability

The following table lists the changes that have been made to the
CVE-2025-4516 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    May. 15, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V4.0 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
    Added CWE CWE-416
    Added Reference https://github.com/python/cpython/commit/69b4387f78f413e8c47572a85b3478c47eba8142
    Added Reference https://github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e
    Added Reference https://github.com/python/cpython/issues/133767
    Added Reference https://github.com/python/cpython/pull/129648
    Added Reference https://mail.python.org/archives/list/[email protected]/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/
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