CVE-2026-42256— net-imap: Denial of service via high iteration count for `SCRAM-*` authentication
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I. Basic Information for CVE-2026-42256
Vulnerability Information
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Vulnerability Title
net-imap: Denial of service via high iteration count for `SCRAM-*` authentication
Source: NVD (National Vulnerability Database)
Vulnerability Description
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. 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
CWE-1322
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-42256
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-42256
Same Patch Batch · ruby · 2026-05-09 · 5 CVEs total
| CVE-2026-42245 | net-imap: Quadratic complexity when reading response literals | |
| 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-2026-42245
net-imap: Quadratic complexity when reading response literal - 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-2026-42245
net-imap: Quadratic complexity when reading response literal - 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
V. Comments for CVE-2026-42256
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