CVE-2026-42245— net-imap: Quadratic complexity when reading response literals
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I. Basic Information for CVE-2026-42245
Vulnerability Information
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Vulnerability Title
net-imap: Quadratic complexity when reading response literals
Source: NVD (National Vulnerability Database)
Vulnerability 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, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
算法复杂性
Source: NVD (National Vulnerability Database)
Vulnerability Title
Net::IMAP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Net::IMAP是Ruby开源的一个消息访问协议的 Ruby 客户端 api。 Net::IMAP 0.4.24之前版本、0.5.14之前版本和0.6.4之前版本存在安全漏洞，该漏洞源于ResponseReader读取包含多个字符串字面量的大响应时具有二次时间复杂度，可能导致拒绝服务攻击。
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
II. Public POCs for CVE-2026-42245
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- Release v0.6.4 · ruby/net-imap · GitHubx_refsource_MISC
- Release v0.5.14 · ruby/net-imap · GitHubx_refsource_MISC
- Release v0.4.24 · ruby/net-imap · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-42245
Same Patch Batch · ruby · 2026-05-09 · 5 CVEs total
| CVE-2026-42256 | net-imap: Denial of service via high iteration count for `SCRAM-*` authentication | |
| CVE-2026-42246 | net-imap vulnerable to STARTTLS stripping via invalid response timing | |
| CVE-2026-42257 | net-imap: Command Injection via "raw" arguments to multiple commands | |
| CVE-2026-42258 | net-imap: Command Injection via unvalidated Symbol inputs |
IV. Related Vulnerabilities
Same product: net-imap
- CVE-2026-42258
net-imap: Command Injection via unvalidated Symbol inputs - CVE-2026-42257
net-imap: Command Injection via "raw" arguments to multiple - CVE-2026-42256
net-imap: Denial of service via high iteration count for `SC - CVE-2026-42246
net-imap vulnerable to STARTTLS stripping via invalid respon - CVE-2025-43857
net-imap rubygem vulnerable to possible DoS by memory exhaus
Same vendor: ruby
- CVE-2026-42258
net-imap: Command Injection via unvalidated Symbol inputs - CVE-2026-42257
net-imap: Command Injection via "raw" arguments to multiple - CVE-2026-42256
net-imap: Denial of service via high iteration count for `SC - CVE-2026-42246
net-imap vulnerable to STARTTLS stripping via invalid respon - CVE-2026-41316
ERB has an @_init deserialization guard bypass via def_modul
Same weakness: CWE-407
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V. Comments for CVE-2026-42245
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