Command Injection via Newline in Python imaplib Module

Publication date: 2026-01-20

Last updated on: 2026-01-20

Assigner: Python Software Foundation

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-20

Last Modified

2026-01-20

Generated

2026-07-06

AI Q&A

2026-01-21

EPSS Evaluated

2026-07-05

NVD

CVE-2025-15366

Affected Vendors & Products

Vendor	Product	Version / Range
python	imaplib	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-77	The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

The vulnerability in the imaplib module allows an attacker to inject additional commands by including newlines in a user-controlled command. This means that if an attacker can control the input to imaplib, they can potentially execute unintended commands. The mitigation involves rejecting commands that contain control characters to prevent this injection.

Impact Analysis

This vulnerability can allow an attacker with some level of access to inject additional commands into the imaplib module, potentially leading to unauthorized actions or manipulation of the IMAP session. This could compromise the integrity or behavior of the application using imaplib.

Mitigation Strategies

Mitigation involves rejecting commands containing control characters to prevent command injection via newlines in the imaplib module.

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