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CVE-2026-47240— Net::IMAP: Command Injection via non-synchronizing literal in "raw" argument

Quick assessment

Affected
ruby net-imap
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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“raw data”参数验证后直接发送，可能允许在非同步字面量中注入任意IMAP命令，导致CRLF命令注入攻击。

AI Predicted 9.1 Difficulty: Easy EPSS 0.83% · P57

Affected Version Matrix 2

VendorProduct Version RangeStatus
ruby net-imap >= 0.6.0, < 0.6.4.1 affected
< 0.5.15 affected
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I. Basic Information for CVE-2026-47240

Vulnerability Information
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Vulnerability Title
Net::IMAP: Command Injection via non-synchronizing literal in "raw" 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, 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.
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“raw data”参数验证后直接发送，可能允许在非同步字面量中注入任意IMAP命令，导致CRLF命令注入攻击。
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

Vendor Product Affected Versions CPE Subscribe
ruby net-imap >= 0.6.0, < 0.6.4.1 -

II. Public POCs for CVE-2026-47240

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III. Intelligence Information for CVE-2026-47240

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Vendor Advisories for CVE-2026-47240 (1)

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

CVE-2026-47242 Net::IMAP: Command Injection via ID command argument
CVE-2026-47241 Net::IMAP: Denial of Service via incomplete raw argument validation

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-47240

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