CVE-2026-0864

MEDIUM

Configuration Injection via Carriage Return (\r) in write() method

Title source: cna

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.

References (7)

Core 7

Core References

Patch patch

https://github.com/python/cpython/pull/151559

Vendor Advisory vendor-advisory

https://mail.python.org/archives/list/[email protected]/thread/CV4NE6AFCRJL7XQOHX7J5TSDHUWVWGJS/

Issue Tracking issue-tracking

https://github.com/python/cpython/issues/143927

Patch patch

https://github.com/python/cpython/commit/0adb386f6e68eb2e73d32e19f235d012df009528

View Patch ZIP pw:eip

Patch patch

https://github.com/python/cpython/commit/71f2e02a52d47417a6fd69f456346cd8aa7aca98

View Patch ZIP pw:eip

Patch patch

https://github.com/python/cpython/commit/aaf850fd333cd89e9aada03d92aaa788a6cb1bb8

View Patch ZIP pw:eip

Patch patch

https://github.com/python/cpython/commit/5858e42c539dac8394636a6e9b30472b8994851f

View Patch ZIP pw:eip

Scores

CVSS v4 4.1

EPSS 0.0013

EPSS Percentile 2.8%

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/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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-74

Status published

Products (2)

Python Software Foundation/CPython < 3.15.0

Python Software Foundation/CPython < 3.15.0b4

Published Jun 23, 2026

Tracked Since Jun 24, 2026