CVE-2026-42256
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductRuby-lang Net\
PublishedMay 9, 2026
First seenMay 9, 2026
How to fix
Update
- ruby-lang net\0.4.24, 0.5.14, 0.6.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ruby-lang net\ | 0.4.0 ≤ v < 0.4.24, 0.5.0 ≤ v < 0.5.14, 0.6.0 ≤ v < 0.6.4 | 0.4.24, 0.5.14, 0.6.4 |
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