The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.
https://mail.python.org/archives/list/[email protected]/thread/DD7C7JZJYTBXMDOWKCEIEBJLBRU64OMR/
https://github.com/python/cpython/pull/143922
https://github.com/python/cpython/issues/143921
https://github.com/python/cpython/commit/f2cd7ef89aa8a0dcbc7283bbd39548b76f2a736a
https://github.com/python/cpython/commit/d0921efb665aff26b378f495e5ff84f7e3fe649d
https://github.com/python/cpython/commit/71926d943c05bde79bd2a866933103541d91b6a2
https://github.com/python/cpython/commit/6262704b134db2a4ba12e85ecfbd968534f28b45
https://github.com/python/cpython/commit/298182272a740ce2016aee2f54acbd0bba1944c1
Published: 2026-01-20
Updated: 2026-07-09
Base Score: 8
Vector: CVSS2#AV:N/AC:L/Au:M/C:P/I:C/A:C
Severity: High
Base Score: 7.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Severity: High
Base Score: 5.9
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Severity: Medium
EPSS: 0.00043