CVE-2026-47240
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby.
Impact
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | net-imap | >= 0.6.0, <= 0.6.4 | 0.6.4.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-8p34-64r3-mwg8
- https://github.com/ruby/net-imap/security/advisories/GHSA-8p34-64r3-mwg8
- https://github.com/ruby/net-imap/releases/tag/v0.6.4.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-47240
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-47240.yml
- https://www.cve.org/CVERecord?id=CVE-2026-47240