CVE-2026-42257CWE-77CWE-93

net-imap: Command Injection via "raw" arguments to multiple commands

Medium · published May 9, 2026

CVSS v4.0
5.8
EPSS
1%
Percentile
43.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.8 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
EPSS
0.00519 · 43.3th percentile
Weaknesses
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection'); CWE-93 · Improper Neutralization of CRLF Sequences ('CRLF Injection')
Published
2026-05-09T19:39Z
EPSS history
Timeline
  • 09 MAY 19:39Z
    net-imap: Command Injection via "raw" arguments to multiple commands
    cvelistv5