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CVE-2025-15366

IMAP command injection in user-controlled commands

MEDIUM
5.9
CVSS Score
Published: January 20, 2026 at 09:40 PM UTC
Updated: August 6, 2026 at 01:16 AM UTC
1 product affected across 1 vendorPython

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Python· Python
60%
v < 3.13.153.14.0 ≤ v < 3.14.73.15.0a1 ≤ v < 3.15.0a63.14.03.15.0a1
Affected range stops below 3.13.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.14.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.15.0a6, so it looks safe — our inference, not a vendor statement

References (8)

Issue Tracking
Source: cverecord
https://github.com/python/cpython/issues/143921
Patch
Source: cverecord
https://github.com/python/cpython/pull/143922
Vendor Advisory
Source: cverecord
https://mail.python.org/archives/list/[email protected]/thread/DD7C7JZJYTBXMDOWKCEIEBJLBRU64OMR/
Patch
Source: cverecord
https://github.com/python/cpython/commit/6262704b134db2a4ba12e85ecfbd968534f28b45
Patch
Source: cverecord
https://github.com/python/cpython/commit/d0921efb665aff26b378f495e5ff84f7e3fe649d
Patch
Source: cverecord
https://github.com/python/cpython/commit/f2cd7ef89aa8a0dcbc7283bbd39548b76f2a736a
Patch
Source: cverecord
https://github.com/python/cpython/commit/298182272a740ce2016aee2f54acbd0bba1944c1
Patch
Source: cverecord
https://github.com/python/cpython/commit/71926d943c05bde79bd2a866933103541d91b6a2

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMPSF
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-77

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