CVE-2026-0864

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.

CVSS 4.0

4.1CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS

0.1% chance of exploitation in the next 30 days; higher than 2% of CVEs (scores of 2026-10-25)

CWE

CWE-74

Published

2026-06-23

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• python:python

References

• https://github.com/python/cpython/commit/0adb386f6e68eb2e73d32e19f235d012df009528
• https://github.com/python/cpython/commit/12dcbd74d3563016a8cb8c47e4898889f34f74dd
• https://github.com/python/cpython/commit/274de100bbf4345bd0c23ef5b446722e9e636908
• https://github.com/python/cpython/commit/5858e42c539dac8394636a6e9b30472b8994851f
• https://github.com/python/cpython/commit/71f2e02a52d47417a6fd69f456346cd8aa7aca98

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