MEDIUM SeverityCVSS 4.05.8CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
CVE-2026-42257
Last updated May 09, 2026 · Published May 09, 2026
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, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Affected products
1 listed- ruby:net-imap
Mappings
CWE
CWE-77CWE-93
CAPEC
None listed.
Related
Training
- Injection TodaySQL, NoSQL, ORM, and LLM injection - what's changed and what hasn't.
- Input Validation and Schema EnforcementValidate early, validate strictly - schemas, allowlists, and type-safe boundaries.
- Secure Defaults in Modern FrameworksHow Rails, Next.js, Django, and Spring protect you - and where they don't.
CVE® content © MITRE Corporation. Licensed under the CVE Terms of Use. Terms