🛡️ CVE-2026-42257
🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-77 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Details

Severity Critical
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-77
Public Exploit ✅ No
Source NVD
Published 2026-05-04
Updated 2026-06-15
Modified 2026-05-13
Fix URL N/A

Affected Packages

Software From version Fixed in
net-imap — 0.4.24
net\ 0.6.0 0.6.4
unknown — —

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