CVE-2026-47241

CVE Details

Release Date:	2026-06-22
Impact:	Moderate	What is this?

Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a raw string argument which is only validated to prevent CRLF injection and then sent verbatim. If this string is derived from user-controlled input, an attacker can force the next command to be absorbed as a continuation of the first command. This will cause the first command to eventually fail, but also prevents it from returning until another command is sent (from another thread). That other command will not return until the connection is closed. This vulnerability is fixed in 0.6.5 and 0.5.15.

See more information about CVE-2026-47241 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.9
Vector String:	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Network
Attack Complexity:	High
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (ruby)	ELSA-2026-50728	2026-08-10
Oracle Linux version 8 (rubygem-abrt)	ELSA-2026-50728	2026-08-10
Oracle Linux version 8 (rubygem-mysql2)	ELSA-2026-50728	2026-08-10
Oracle Linux version 8 (rubygem-pg)	ELSA-2026-50728	2026-08-10
Oracle Linux version 9 (ruby)	ELSA-2026-50827	2026-08-10
Oracle Linux version 9 (ruby)	ELSA-2026-50828	2026-08-07
Oracle Linux version 9 (rubygem-mysql2)	ELSA-2026-50827	2026-08-10
Oracle Linux version 9 (rubygem-mysql2)	ELSA-2026-50828	2026-08-07
Oracle Linux version 9 (rubygem-pg)	ELSA-2026-50827	2026-08-10
Oracle Linux version 9 (rubygem-pg)	ELSA-2026-50828	2026-08-07