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

Quick assessment

Affected
Python Software Foundation CPython
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python存在资源管理错误漏洞，该漏洞源于使用bytes.decode(unicode_escape)时错误处理不当，可能导致解码错误。

CVSS 5.9 · Medium EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.9.23 affected
3.10.0< 3.10.18 affected
3.11.0< 3.11.13 affected
3.12.0< 3.12.11 affected
3.13.0< 3.13.4 affected
3.14.0a1< 3.14.0b2 affected
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I. Basic Information for CVE-2025-4516

Vulnerability Information
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Vulnerability Title
Use-after-free in "unicode_escape" decoder with error handler
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Python 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python存在资源管理错误漏洞，该漏洞源于使用bytes.decode(unicode_escape)时错误处理不当，可能导致解码错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Software Foundation CPython 0 ~ 3.9.23 -

II. Public POCs for CVE-2025-4516

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III. Intelligence Information for CVE-2025-4516

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Patches & Fixes for CVE-2025-4516 (2)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation
Same weakness: CWE-416

V. Comments for CVE-2025-4516

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