CVE-2025-4516 Use-after-free in "unicode_escape" decoder with error handler

There is an issue in CPython when using bytes.decode"unicodeescape", error="ignore|replace". If you are not using the "unicodeescape" 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 ...

CVE-2025-4516

CVE-2025-4516 describes a crash in CPython when using bytes.decode("unicode_escape", error=...) with the specific encoding and error handler. The connected Debian advisory (DLA-4445-1) notes this affects python3.9 and provides upgrade guidance (python3.9 3.9.2-1+deb11u4) with a patched package av...

CVE-2025-4516

There is an issue in CPython when using bytes.decode"unicodeescape", error="ignore|replace". If you are not using the "unicodeescape" 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 ...

cpython -- Use-after-free in "unicode_escape" decoder with error handler

[email protected] reports: There is an issue in CPython when using bytes.decode"unicodeescape", error="ignore|replace". If you are not using the "unicodeescape" 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 t...