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CVE-2026-47241— Net::IMAP: Denial of Service via incomplete raw argument validation

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存在输入验证错误漏洞，该漏洞源于多个Net::IMAP命令接受原始字符串参数并仅验证防止CRLF注入，可能导致攻击者强制下一个命令被吸收为第一个命令的延续，导致命令失败并阻止返回直至连接关闭。以下版本受到影响：0.6.0版本至0.6.4.1版本和0.5.15之前版本。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-47241

Vulnerability Information
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Vulnerability Title
Net::IMAP: Denial of Service via incomplete raw argument validation
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 string argument which is only validated to prevent CRLF injection and then sent verbatim. If this string is derived from user-controlled input, an attacker can force the next command to be absorbed as a continuation of the first command. This will cause the first command to eventually fail, but also prevents it from returning until another command is sent (from another thread). That other command will not return until the connection is closed. This vulnerability is fixed in 0.6.5 and 0.5.15.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
结尾特殊元素转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Ruby net-imap 输入验证错误漏洞
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存在输入验证错误漏洞，该漏洞源于多个Net::IMAP命令接受原始字符串参数并仅验证防止CRLF注入，可能导致攻击者强制下一个命令被吸收为第一个命令的延续，导致命令失败并阻止返回直至连接关闭。以下版本受到影响：0.6.0版本至0.6.4.1版本和0.5.15之前版本。
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-2026-47241

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III. Intelligence Information for CVE-2026-47241

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Vendor Advisories for CVE-2026-47241 (1)

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

CVE-2026-47242 Net::IMAP: Command Injection via ID command argument
CVE-2026-47240 Net::IMAP: Command Injection via non-synchronizing literal in "raw" argument

IV. Related Vulnerabilities

Same product: net-imap
Same vendor: ruby

V. Comments for CVE-2026-47241

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