CVE-2026-42245
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductRuby-lang Net\
PublishedMay 9, 2026
First seenMay 9, 2026
Weakness typeCWE-407CWE-407
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\ | \ ≤ 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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