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                            CERT-Renater

                Note d'Information No. 2025/VULN320

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DATE                : 16/05/2025

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running CPython.

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https://mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/
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[CVE-2025-4516] Use-after-free crash using bytes.decode("unicode_escape", error="ignore|replace")

Seth Larson
15 mai 2025 13:33

There is a MEDIUM severity security issue in CPython when using
bytes.decode("unicode_escape", error="ignore|replace"). The
use-after-free being exploited would likely result in a crash.

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 decoding error.

Please see the linked CVE ID for the latest information on affected
versions:

    https://www.cve.org/CVERecord?id=CVE-2025-4516
    https://github.com/python/cpython/pull/129648


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