CVE-2026-47240

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 data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.

See more information about CVE-2026-47240 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:	6.1
Vector String:	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	Required
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	High
Availability Impact:	Low

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