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CVE-2026-47242— Net::IMAP: Command Injection via ID command argument

AI Predicted 7.4 Difficulty: Moderate EPSS 0.13% · P3

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProductVersion RangeStatus
rubynet-imap>= 0.6.0, < 0.6.4.1affected
< 0.5.15affected
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I. Basic Information for CVE-2026-47242

Vulnerability Information
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Vulnerability Title
Net::IMAP: Command Injection via ID command argument
Source: CVE Program / CVE List V5
Vulnerability Description
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to prohibit CRLF sequences. While Net::IMAP#enable does process its arguments for aliases, it does not validate them as valid atoms (or as a list of valid atoms). The #to_s value is sent verbatim. Arguments to either command could be used by an attacker to inject arbitrary IMAP commands. This vulnerability is fixed in 0.6.5 and 0.5.15.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Ruby net-imap 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby net-imap是Ruby的邮件客户端协议库。 Ruby net-imap存在命令注入漏洞，该漏洞源于ID字段值未验证禁止CRLF序列以及enable参数未验证为有效原子，可能导致攻击者注入任意IMAP命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
rubynet-imap >= 0.6.0, < 0.6.4.1 -

II. Public POCs for CVE-2026-47242

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III. Intelligence Information for CVE-2026-47242

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Vendor Advisories for CVE-2026-47242 (1)

Same Patch Batch · ruby · 2026-06-22 · 3 CVEs total

CVE-2026-47241Net::IMAP: Denial of Service via incomplete raw argument validation
CVE-2026-47240Net::IMAP: Command Injection via non-synchronizing literal in "raw" argument

IV. Related Vulnerabilities

Same product: net-imap
Same vendor: ruby
Same weakness: CWE-77

V. Comments for CVE-2026-47242

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