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Vulnerability record · CVE-2026-0864 · published 23 June 2026

CVE-2026-0864: Python injection vulnerability

Python · Python

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.

4.1 CVSS 4.0 Medium EPSS 0.13% · top 97.7% CWE-74 · Injection
4.1CVSS 4.0 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
25 Oct 2026Last modified by NVD

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.

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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python/cpython/commit/0adb386f6e68eb2e73d32e19f235d012df009528 Patch
https://github.com/python/cpython/commit/12dcbd74d3563016a8cb8c47e4898889f34f74dd Patch
https://github.com/python/cpython/commit/274de100bbf4345bd0c23ef5b446722e9e636908 Patch
https://github.com/python/cpython/commit/5858e42c539dac8394636a6e9b30472b8994851f Patch
https://github.com/python/cpython/commit/71f2e02a52d47417a6fd69f456346cd8aa7aca98 Patch
https://github.com/python/cpython/commit/aaf850fd333cd89e9aada03d92aaa788a6cb1bb8 Patch
https://github.com/python/cpython/commit/db4a157c790479710a1a840d7937c5c815a6f8b6 Patch
https://github.com/python/cpython/issues/143927 Issue TrackingPatch
https://github.com/python/cpython/pull/151559 Issue TrackingPatch
https://mail.python.org/archives/list/security-announce@python.org/thread/CV4NE6AFCRJL7XQOHX7J5TSDHUWVWGJS/ Mailing ListVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-0864), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.