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CVE-2026-42258

net-imap: Command Injection via unvalidated Symbol inputs

Published: May 9, 2026Updated: May 18, 2026 Sources: CVE List NVDCWE-77
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.9%
Top 43.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-77CWE-93

Affected Products

net\ruby-lang
Library
OSS Libraries / generic-library
net-imapruby
Library
OSS Libraries / rubygems
ruby-langoss-projectOSS Librariesaka ruby, rexml
rubyoss-projectJPOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

1 technique
Execution
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References

https://github.com/ruby/net-imap/releases/tag/v0.4.24
github.com
https://github.com/ruby/net-imap/releases/tag/v0.5.14
github.com
https://github.com/ruby/net-imap/releases/tag/v0.6.4
github.com
and 1 more references View all →

Timeline

Published
May 9, 2026
Last Updated
May 18, 2026

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