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CVE-2026-0864— Configuration Injection via Carriage Return (\r) in write() method

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 Software Foundation CPython是Python Software Foundation基金会的编程语言解释器。 Python 3.15.0之前版本存在输入验证错误漏洞，该漏洞源于使用“configparser”模块写入包含回车字符（\r）的多行文本值的配置文件时，若攻击者控制写入值，可能注入意外键和值。

CVSS 4.1 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.10.21 affected
3.11.0< 3.11.16 affected
3.12.0< 3.12.14 affected
3.13.0< 3.13.15 affected
3.14.0< 3.14.7 affected
3.15.0a1< 3.15.0b4 affected
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I. Basic Information for CVE-2026-0864

Vulnerability Information
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Vulnerability Title
Configuration Injection via Carriage Return (\r) in write() method
Source: CVE Program / CVE List V5
Vulnerability Description
When using the "configparser" module to write configuration files containing multi-line text values with carriage return characters (\r) the resulting file could be injected with unexpected keys and values if the attacker controls the written value.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Python 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python Software Foundation CPython是Python Software Foundation基金会的编程语言解释器。 Python 3.15.0之前版本存在输入验证错误漏洞，该漏洞源于使用“configparser”模块写入包含回车字符（\r）的多行文本值的配置文件时，若攻击者控制写入值，可能注入意外键和值。
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 ~ 3.10.21 -

II. Public POCs for CVE-2026-0864

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III. Intelligence Information for CVE-2026-0864

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Patches & Fixes for CVE-2026-0864 (4)

Mailing List Discussions for CVE-2026-0864 (1)

Same Patch Batch · Python Software Foundation · 2026-06-23 · 3 CVEs total

CVE-2026-11972 8.2 HIGH tarfile opened in streaming mode mishandles EOF
CVE-2026-11940 7.8 HIGH tarfile extraction filter bypass allows escaping the destination directory

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2026-0864

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